A video doorbell is a security device that is installed at the entrance to a home or building and is designed to allow the occupants to see and communicate with visitors remotely. It typically consists of a camera, a speaker, and a microphone, and it connects to the internet or a local network to allow remote access.

When a visitor presses the doorbell button or triggers a motion sensor, the video doorbell sends an alert to the occupants' smartphones or other devices, and they can then view a live video feed of the visitor and communicate with them through the speaker and microphone. The video doorbell may also record video of the visitor and store it for later viewing.

Video doorbells can provide an added layer of security by allowing occupants to see who is at the door before opening it, and they can also be used to monitor activity at the entrance when the occupants are away. They are often used in conjunction with other security devices such as smart locks and security cameras to provide a comprehensive security solution.