IVR stands for Interactive Voice Response, a technology that automates routine customer service interactions by permitting callers to interact using touch-tone digits or their voice. A basic example of an IVR application is an automated attendant or voice menu: callers are presented with a recorded menu and respond by selecting a digit or, in some cases, by entering an extension number.
For more explanation on this video: https://www.linuxhelp.com/how-to-crea...