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 agents don't charge you, they get a commission from the hotels and airlines they book you with. However, if you go to the hotels or airlines directly you will almost always get a better price. Use websites like http://www.sidestep.com to find the best deals. occamsrazor605 Â· 7 years ago.