How do I clear all app cache?

Tap on Storage or Storage & Memory (the wording differs by Android version and device). Now, tap on “Cached Data” which displays the amount of cached data on your device. A popup will appear asking you if you want to “Clear cached data”. Tap OK to clear all the cache on your device.

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What will happen if I clear my app cache?

When the app cache is cleared, all of the mentioned data is cleared. Then, the application stores more vital information like user settings, databases, and login information as data. More drastically, when you clear the data, both cache and data are removed.