1 converts written data into sound waves. 2  converts the sound waves from a voice into a digital signal. 3  converts letters from the keyboard into digital format. 4  converts digital sound waves into analog sound waves.
Travel agencies make their money in a variety of ways. The products agents sell have built-in fees that result in a profit for the agency. The amount of the fees and the ways in which they are earned and distributed differ by the type of product sold and the suppliers who provide that product to the agency.
At times, the services of a travel agent can be extremely useful; travel agents often have access to cheap fares, hotel deals, and other travel perks which average consumers cannot get on their own. A travel agent may choose to work freelance, or as part of a larger travel agency.t a minimum, a travel agent can book tickets for people who wish to travel to a particular destination; most travel agents focus on air, rail, and sea travel and the myriad options available, including varying classes and routes.