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.
travel agency (travel agencies plural) A travel agency is a business which makes arrangements for people's holidays and journeys. n-count. travel agent (travel agents plural). 1 n-count A travel agent or travel agent's is a shop or office where you can go to arrange a holiday or journey. He worked in a travel agent's.2 n-count A travel agent is a person or business that arranges people's holidays and journeys. travel rep (travel reps plural) A travel rep is the same as a holiday rep. n-uncount Travel is the activity of travelling. He detested air travel., ...a writer of travel books. 3 verb If you travel the world, the country, or the area, you go to many different places in the world or in a particular country or area.