A thermostat is a device used to control the temperature within a specific room or area. It is usually mounted on a wall and connected to a heating or cooling system. Thermostats allow you to set and maintain the desired temperature by detecting the current temperature in the room and activating the heating or cooling system accordingly.

This helps provide comfort and energy efficiency by heating or cooling the room to the desired level. Some advanced thermostats even offer programmable features, so you can set different temperatures depending on the time of day.