What does the Invalidate Caches/Restart do in Android Studio?

Issue

I have seen many answers suggest that one should Invalid Caches/Restart in order to improve the performance of Android Studio, whether it's memory or CPU. It also can be used to set up correct themes. I was wondering what it actually does though, since it seems to be the solution to so many problems.

Solution

Android Studio makes a lot of files as caches and does not delete them. This can cause trouble when there is a need to make new files, so clearing caches will clear the old cache and make Android Studio faster.

Answered By - DevUt