Interactive voice response systems, or IVR systems, are automated phone systems that allow users to interact with a computer using their voice or keypad inputs. These systems are commonly used in customer service to help route calls, provide information, or assist with transactions without the need for a human operator. Typically, when a caller dials a number, the IVR system greets them with a menu of options. Users can select their desired option by speaking or pressing a number on their phone. This technology helps streamline communication and improve efficiency for businesses and customers alike.