An intercom is a communication device that allows people to talk to each other over short distances, often within a building. It typically consists of a microphone and speaker, enabling two-way communication. Intercoms are commonly used in homes, offices, and schools to facilitate quick conversations without needing to move from one location to another. Modern intercom systems can be wired or wireless and may include additional features like video capabilities, allowing users to see who they are communicating with. They are often integrated with security systems, such as cameras, to enhance safety and monitoring in various environments.