Clearing your cache means deleting the information automatically stored to your device when visiting a new site or opening an app.
Android smartphones have an application manager that you can get to through the settings menu. It's usually in the top-level somewhere, though it can vary a little by phone. This area is where you can see every application that's installed on your phone or tablet. And it's a handy place to clean things up a bit should they go wonky.
The app cache (and how to clear it)
As you use applications, they start storing files to reference later. These files are stored in an app "cache."
This method is how you can clear the CACHE.
1. Open the Settings of your phone.
2. Select the Apps option.
3. Tap on the app you want to clear app data for and select Storage
4. Tap Clear Data and Clear Cache
The next time you use the app, it will download everything it needs from the internet like it did the first time you used it. This often fixes things, especially when an app pulls its content from a website that is always changing and adding more content. If you want to clear the storage completely, repeat these steps, and choose the Clear storage button in the final step. Warning: This will remove all of the app's data, including usernames and passwords, game progress, etc.,