An auto dialer is software that automates the dialing process and eliminates manual dialing. The agents need not focus on dialing the numbers as they automatically connect to the customer/ prospects. They are only concerned about resolving the customers’ queries as they know the software has dialed the correct number.
Source: https://deeptechdiscovery.com/what-are-auto-dialers-define-the-4-types-of-auto-dialers/