A video doorbell is a smart device that combines a doorbell with a camera. It allows homeowners to see and communicate with visitors at their door through a smartphone or tablet. When someone presses the doorbell, the camera activates, capturing video footage and sending a notification to the homeowner's device. These devices often include features like two-way audio, night vision, and motion detection. Many video doorbells can be integrated with smart home systems, enhancing security and convenience. Popular brands include Ring, Nest, and Arlo, each offering various models with different functionalities.