👉 A doorbell is a device that rings when someone approaches the door, typically used to notify the owner of a visitor or to request a response. It is often a simple bell with a handle and a button that can be pressed to ring. There are different types of doorbells, including: 1. Push-button doorbells: These use a push button to activate the bell. 2. Dial-up doorbell: This uses a dial or a remote control to activate the bell. 3.