A telemarketer is an individual who contacts potential or existing customers by telephone in order to sell them a product or service, or to solicit donations. Telemarketers are often employed in call centers. The Federal Trade Commission (FTC) defines telemarketing as "the practice of selling goods or services by calling prospective customers on the telephone and inducing them to buy something." The FTC has enacted rules to protect consumers from unwanted telemarketing calls, including the Telephone Consumer Protection Act (TCPA) of 1991. The TCPA prohibits telemarketers from making certain types of calls, such as robocalls, without prior consent from the consumer.