Callback
Updated: 04/30/2020 by Computer Hope
A callback may refer to any of the following:
1. A security feature that verifies the dial-in user is who they say they are by calling the person back. After the callback and the username, password, and any other information are verified, they are granted access.
2. A callback is also another name for a returned phone call.
3. In computer programming, a callback is a function that is passed as an argument to another function. When that function completes, it executes the callback function, "calling back" to signal its completion.
Callbacks are used in asynchronous programming, where the main program loop does not wait for individual functions to complete before continuing with program flow.