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.
Some agents do charge a per-hour fee when theyâre planning a trip, and agents can earn commission on some of their bookings. But, you can typically expect a travel agent to cost around the same as if youâd booked it yourself. When you factor in the time it saves you, travel agents may be worth the cost.