A monitor is a screen that displays images and information from a computer. It allows users to see what they are working on, whether it's writing a document, watching a video, or playing a game. Monitors come in various sizes and types, including LCD and LED screens, and they connect to the computer using cables. In addition to computers, the term monitor can also refer to devices that track or observe something. For example, a heart rate monitor checks a person's heartbeat, while a baby monitor lets parents listen to their sleeping child. Both types help keep us informed and safe.