
Closing (real estate)

Closing (also referred to as completion or settlement) is the final step in executing a real estate transaction.
The closing date is set during the negotiation phase, and is usually several weeks after the offer is formally accepted. On the closing date, the ownership of the property is transferred to the buyer. In most jurisdictions, ownership is officially transferred when a deed from the seller is delivered to the buyer. Lenders providing a mortgage loan will often require title search, title insurance, appraisal, land survey, and attorneys to be involved.
Several things happen during closing:
It is common for a transaction to close on one day but possession to occur at a later date. The buyer rents the house back to the seller during the interim. If the clause in the contract is worded improperly, the buyer is liable for damage done by the ‘tenant’. As a rule, addenda and creative clauses should be reviewed by a real estate attorney to insure compliance with local law and protection for all parties.
In some cases, closing in escrow may occur. In this process, a title company or other trusted party holds the money and the signed deed, and arranges for the transfer---primarily so that the seller can give up ownership, and the buyer can hand over payment, without both parties having to be present at the closing at the same time. Escrow ensures an orderly transaction, or if something goes wrong, an orderly termination of the agreement.
In other cases, a process called "settlement" takes place on a specified date and time during which all parties (usually including the agents involved) meet at a settlement company, and which is presided over or supervised by a lawyer or settlement agent. At that time, the settlement agent disburses all funds listed on the settlement statement (in the form of certified or wired funds) and the property conveyance takes place. The deed is then recorded by the settlement company.
A final walkthrough is recommended to ensure property is in an agreeable condition to close escrow. 
A reference to "completion" is in effect the same as closing and takes its name from the contract to convey property having been completed once the balance owed on the purchase price has been paid to the seller and title transferred to the buyer.
References.
https://www.daveramsey.com/blog/closing-on-a-house