A smart doorbell is a device that combines a traditional doorbell with advanced technology. It typically features a camera, microphone, and speaker, allowing homeowners to see and communicate with visitors remotely through their smartphones or tablets. Many smart doorbells also include motion detection and night vision capabilities for added security. These devices can be connected to home automation systems and may integrate with other smart home products, such as smart locks and security cameras. Some popular brands include Ring, Nest, and Arlo, each offering various features to enhance home security and convenience.