ELI5: Explain Like I'm 5

Heater

A heater is a device that produces heat. It works by using energy, like electricity, to make the air around it warmer. The energy is converted into heat and then distributed into the room. Heaters have temperature settings which allow you to choose how warm you want the air to be. Some heaters can also be set to a timer to turn off after a certain amount of time, which is useful for saving energy.