Your Android phone's biggest space hogs aren't always the ones you can see. If your storage is filling up faster than it should, hidden files you've never touched might be the reason.

6 App Cache and App Data

Every app you use stores temporary files, called cache, to speed up loading. Social media, browsers, and streaming apps often build the largest caches because they process so many images and videos. Over time, this cache can become huge. Clearing it is a way to free up space instantly without removing your saved logins or settings.

App data is different. It holds your personal settings, saved accounts, and sometimes files downloaded within the app. Deleting it resets the app to its default state, which means you need to log in again and set your preferences. Doing so can be helpful

See Full Page