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.
Therefore the travel agency becomes a purchasing advisor and provides the client with a general idea about the trip when he or she walks into their office. A travel agency can specialize in a particular destination or a specific trip type, like adventure, fishing, rock climbing, or perhaps in a near future, space. How do they make money? Two ways: first by taking a percentage from their providers (hotel, travel operators, airline companies), second on commissions billed to the client.