What are futures and how are they different from options?
Cart's answer is basically correct, but I'd like to elaborate: A futures contract obligates both the buyer of a contract and the seller of a contract to conduct the underlying transaction (settle) at the agreed-upon future date and price written into the contract. Aside from settlement, the only other way either party can get out of the transaction is to initiate a closing transaction, which means:  The party that sold the contract buys back another similar contract to close his position.  The party that bought the contract can sell the contract on to somebody else. Whereas, an option contract provides the buyer of the option with the choice of completing the transaction.  Because it's a choice, the buyer can choose to walk away from the transaction if the option exercise price is not attractive relative to the underlying stock price at the date written into the contract.  When an option buyer walks away, the option is said to have expired. However – and this is the part I think needs elaboration – the original seller (writer) of the option contract doesn't have a choice.  If a buyer chooses to exercise the option contract the seller wrote, the seller is obligated to conduct the transaction.  In such a case, the seller's option contract is said to have been assigned.  Only if the buyer chooses not to exercise does the seller's obligation go away.  Before the option expires, the option seller can close their position by initiating a closing transaction.  But, the seller can't simply walk away like the option buyer can. For futures, you are obligated to puchase the security at $x when the contract expires.  For an option, you have the right or option to do so if it's favorable to you.
"**Modern portfolio theory**  Modern portfolio theory (MPT), or mean-variance analysis, is a mathematical framework for assembling a portfolio of assets such that the expected return is maximized for a given level of risk, defined as variance. Its key insight is that an asset's risk and return should not be assessed by itself, but by how it contributes to a portfolio's overall risk and return.  Economist Harry Markowitz introduced MPT in a 1952 essay, for which he was later awarded a Nobel Prize in economics.  ***  **Option (finance)**  In finance, an option is a contract which gives the buyer (the owner or holder of the option) the right, but not the obligation, to buy or sell an underlying asset or instrument at a specific strike price on a specified date, depending on the form of the option. The strike price may be set by reference to the spot price (market price) of the underlying security or commodity on the day an option is taken out, or it may be fixed at a discount in a premium. The seller has the corresponding obligation to fulfill the transaction—to sell or buy—if the buyer (owner) ""exercises"" the option. An option that conveys to the owner the right to buy at a specific price is referred to as a call; an option that conveys the right of the owner to sell at a specific price is referred to as a put.  ***  ^[ [^PM](https://www.reddit.com/message/compose?to=kittens_from_space) ^| [^Exclude ^me](https://reddit.com/message/compose?to=WikiTextBot&amp;message=Excludeme&amp;subject=Excludeme) ^| [^Exclude ^from ^subreddit](https://np.reddit.com/r/finance/about/banned) ^| [^FAQ ^/ ^Information](https://np.reddit.com/r/WikiTextBot/wiki/index) ^| [^Source](https://github.com/kittenswolf/WikiTextBot)   ^] ^Downvote ^to ^remove ^| ^v0.27" R/stockmarket is probably the best.  When I have some free time I can test that strategy back as long as you would like in quantstrat, although the only problem with testing futures is joining the consolidated contracts, however I can test it with SPY as SPY returns and ES_F track very closely. Both of these are futures contracts on the Ibovespa Brasil Sao Paulo Stock Exchange Index; the mini being exactly that, a mini version (or portion) of the regular futures contract. The mini counterpart makes trading the index more affordable to individual investors and hence increase liquidity. If you know what you are doing, bear markets offer fantastic trading opportunities. I'm a futures and futures options trader, and am equally comfortable trading long or short, although I have a slight preference for the short side, in that moves are typically much quicker to the down side. The futures market trades 24 hours a day, 5.5 days a week. S&P 500 futures market continues trading, and this gives pricing exposure and influences the individual stocks when they resume trading in US session. There are two basic kinds of derivatives - forward contracts and options.   A forward is an agreement between two parties for one party to buy/sell some asset to the other at a price that they agree upon today at some date in the future. An option is an agreement that gives one party the right, but not the obligation, to buy/sell the asset at some date in the future.  Most derivatives that exist are a combination of these two things. For instance, a futures contract is a standardized forward contract that is traded on an exchange, and a swap is a portfolio (or chain) of forward contracts linked together. American/Bermudan options are just options that allow you to exercise on more than one day. "In general economic theory, there are always two markets created based on a need for a good; a spot market (where people who need something now can go outbid other people who need the same thing), and a futures market (where people who know they will need something later can agree to buy it for a pre-approved price, even if the good in question doesn't exist yet, like a grain crop). Options exist as a natural extension of the futures market. In a traditional future, you're obligated, by buying the contract, to execute it, for good or ill. If it turns out that you could have gotten a lower price when buying, or a higher price when selling, that's tough; you gave up the ability to say no in return for knowing, a month or three months or even a year in advance, the price you'll get to buy or sell this good that you know you need. Futures thus give both sides the ability to plan based on a known price, but that's their only risk-reduction mechanism. Enter the option. You're the Coors Brewing Company, and you want to buy 50 tons of barley grain for delivery in December in order to brew up for the Super Bowl and other assorted sports parties. A co-op bellies up to close the deal. But, since you're Coors, you compete on price with Budweiser and Miller, and if you end up paying more than the grain's really worth, perhaps because of a mild wet fall and a bumper crop that the almanac predicts, then you're going to have a real bad time of it in January. You ask for the right to say ""no"" when the contract falls due, if the price you negotiate now is too high based on the spot price. The co-op now has a choice; for such a large shipment, if Coors decided to leave them holding the bag on the contract and instead bought it from them anyway on a depressed spot market, they could lose big if they were counting on getting the contract price and bought equipment or facilities on credit against it. To mitigate those losses, the co-op asks for an option price; basically, this is ""insurance"" on the contract, and the co-op will, in return for this fee (exactly how and when it's paid is also negotiable), agree to eat any future realized losses if Coors were to back out of the contract.  Like any insurance premium, the option price is nominally based on an outwardly simple formula: the probability of Coors ""exercising"" their option, times the losses the co-op would incur if that happened. Long-term, if these two figures are accurate, the co-op will break even by offering this price and Coors either taking the contract or exercising the option. However, coming up with accurate predictions of these two figures, such that the co-op (or anyone offering such a position) would indeed break even at least, is the stuff that keeps actuaries in business (and awake at night)." Futures exchanges are essentially auction houses facilitating a two-way auction. While they provide a venue for buyers and sellers to come together and transact (be that a physical venue such as a pit at the CME or an electronic network such as Globex), they don't actively seek out or find buyers and sellers to pair them together. The exchanges enable this process through an order book. As a futures trader you may submit one of two types of order to an exchange: Market Order - this is sent to the exchange and is filled immediately by being paired with a limit order.   Limit Order - this is placed on the books of the exchange at the price you specify. If other participants enter opposing market orders at this price, then their market order will be paired with your limit order. In your example, trader B wishes to close his long position. To do this he may enter a market sell order, which will immediately close his position at the lowest possible buy limit price, or he may enter a limit sell order, specifying the price at or above which he is willing to sell. In the case of the limit order, he will only sell and successfully close his position if his order becomes the lowest sell order on the book. All this may be a lot easier to understand by looking at a visual image of an order book such as the one given in the explanation that I have published here: Stop Orders for Futures Finally, not that as far as the exchange is concerned, there is no difference between an order to open and an order to close a position. They're all just 'buy' or 'sell' orders. Whether they cause you to reduce/exit a position or increase/establish a position is relative to the position you currently hold; if you're flat a buy order establishes a new position, if you're short it closes your position and leaves you flat. On the US markets, most index options are European style.  Most stock and ETF options are, as you noted, American style. "Futures are an agreement to buy or sell something in the future.  The futures ""price"" is the price at which you agree to make the trade.  This price does not indicate what will happen in the future so much as it indicates the cost of buying the item today and holding it until the future date.  Hence, for very liquid products such as stock index futures, the futures price is a very simple function of today's stock index value and current short-term interest rates.  If the stock exchange is closed but the futures exchange is open, then using the futures price and interest rates one can back out an implied ""fair value"" for the index, which is in essence the market's estimate of what the stock index value would be right now if the stock market were open.  Of course, as soon as the stock exchange opens, the futures price trades to within a narrow band of the actual index value, where the size of the band depends on transaction costs (bid-ask spread, commissions, etc.)." I know I can not trade futures realistically (I never claimed I could). All I wanted was some exposure to commodities.  If I could just trade many of these things in an ETF like GLD or XLV, I would have done that.   On the topic of margin, I appreciate your explaining that to me. I admit readily that I could never invest in futures straight, but I would like to get into commodities and other types of investments. I have tried to look for value in the market, but I have not found many things I would put my money in. I have gone as far as to look through OTC ADRs to find some foreign value, and I found nothing. I just want to be able to trade in any market, and I would consider shorting, but I don't like to be too risky. I want to go long on positions, and it seemed like commodities may be a good speculation to LOOK INTO. Taking rough rice as an example, there are millions (if not billions) of people who eat rice to survive. People will always need oil to fuel their cars. People will always need electricity. So I guess what I am trying to do is look into things that allow me to profit, regardless of where equities are going. The only thing I want to do is trade the options of the futures, not the actual futures themselves. I hope I did not confuse you. If I can earn even $20 from buying an option at a lower price and selling higher, it would allow me to have a greater breadth of tools to use when the market may be overvalued. "The third Friday of each month is an expiration for the monthly options on each stock.  Stock with standardized options are in one of three ""cycles"" and have four open months at any give time.  See http://www.investopedia.com/terms/o/optioncycle.asp In addition some stocks have weekly options now.  Those generally have less interest because they are necessarily short-term.  Anything expiring on April 8 and 22 (Fridays this year but not third Fridays of the month) are weeklies. The monthly options are open for longer periods of time so they attract more interest over the time that they are open.  They also potentially attract a different type of investor due to their length of term, although, as it gets close to their expiration date they may start to behave more like weeklies." What you should compare is SPX, SPY NAV, and ES fair value.   Like others have said is SPX is the index that others attempt to track. SPY tracks it, but it can get a tiny bit out of line as explained here by @Brick .  That's why they publish NAV or net asset value.  It's what the price should be.  For SPY this will be very close because of all the participants.  The MER is a factor, but more important is something called tracking error, which takes into account MER plus things like trading expenses plus revenue from securities lending.  SPY (the few times I've checked) has a smaller tracking error than the MER.  It's not much of a factor in pricing differences. ES is the price you'll pay today to get SPX delivered in the future (but settled in cash).  You have to take into account dividends and interest, this is called fair value.  You can find this usually every morning so you can compare what the futures are saying about the underlying index. http://www.cnbc.com/pre-markets/ The most likely difference is you're looking at different times of the day or different open/close calculations. Futures contracts are a member of a larger class of financial assets called derivatives. Derivatives are called such because their payoffs depend on the price of other assets (financial or real). Other kinds of derivatives are call options, put options. Fixed income assets that mimic the behavior of derivatives are callable bonds, puttable bonds etc.  A futures contract is a contract that specifies the following: Just like with any other contract, there are two parties involved. One party commits to delivering the underlying asset to the other party on expiration date in exchange for the futures price. The other party commits to paying the futures price in exchange for the asset. There is no price that any of the two parties pay upfront to engage in the contract. The language used is so that the agent committing to receiving the delivery of the underlying asset is said to have bought the contract. The agent that commits to make the delivery is said to have sold the contract.  So answer your question, buying on June 1 a futures contract at the futures price of $100, with a maturity date on August 1 means you commit to paying $100 for the underlying asset on August 1. You don't have to pay anything upfront. Futures price is simply what the contract prescribes the underlying asset will exchange hands for. "If there's one thing the futures markets don't lack, it's leverage. It's more than even most of the most aggressive investors use.  Trading options might make more sense for some investors, but I can't think of how this would be ""a safer way"" compared to owning actual futures contracts, even at relatively high leverage."