Question

What is clear cache in android?

Answer 1

Clearing app data is a little more drastic. You're wiping the cache, but also clearing any and all settings that go along with that app. You're basically starting that app over, from scratch, and it'll behave as it did the first time you installed it.
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Answer 2

Cache are usually the useless files that are created while using them or in simple words they are RAM. CLEAR CACHE means removing these unwanted files as they are of no use when the app is not working. These files are created everyone whenever we use a particular app.