Why is my left analog stick from my controller acts weird?

When I was playing a game on Steam with my controller, the left analog stick is acting weird, even when I was not moving the analog stick. The input happens automatically, and it is not my fault. The left analog stick is acting weird that it is a problem to me. I need a help with this issue.

2021-01-18T06:42:34Z

The controller that I have is a PlayStation 4 controller.

spakghost232021-01-18T22:19:05Z

It's called stick drift. A quick solution would be to blow into the left stick.