An intercom is a communication system that allows people to talk to one another through a network of connected devices. It can be used for a variety of purposes, including communication between rooms in a home or office, communication between vehicles or between the drivers and the control center in the case of transportation systems, and.

communication between a person at a secure entry point and visitors outside. Intercoms can be hardwired, wireless or IP-based, and can be connected to other devices such as speakers, telephones, and CCTV cameras to provide additional functionality.

Some intercoms also support two-way communication, which allows multiple parties to talk and listen simultaneously, while other support one way communication.