The Call Center industry provides a large percent of employment in the United States. There are many classifications of Call Centers and these mainly depend on the kind of service they provide.

A call center is a centralized office that answers incoming telephone calls from customers for the purposes of product support and complaint. These call centers also make outgoing telephone calls to customers that is more commonly known as telemarketing. An office may also respond to letters, faxes, e-mails and similar written correspondence.

The typical call center is usually set-up in a large room or an entire floor of a building, with workstations that include a computer, a telephone set hooked into a large telecom switch and one or more supervisor stations. The call center may be linked to a network of other call centers or a corporation