ELI5: Explain Like I'm 5

Timer

A timer is a device that helps you keep track of how much time has passed. It counts how many seconds, minutes or hours have passed. You can use it to help you remember to do things or set a limit for how long something should take. For example, you can use a timer to remind yourself to take a break from studying or to turn off the TV after 20 minutes. It can be a helpful tool to make sure you stay on track!