What is an accelerometer?
How does it work?
Are you aware of its applications?
Every smartphone is integrated with accelerometer sensor that can identify orientation/direction. Changing the direction of smartphones according to tilts, counting your steps by health apps, and many other interesting facts are related to accelerometer. It is important to know about what is an accelerometer and the applications also.
https://blog.guruface.com/what-is-an-accelerometer-and-how-it-works/