The apps on your Android device typically use a cache to improve performance. Over time, the cache for certain apps can grow quite large. Clearing the app cache can free up precious space and sometimes resolve problems you might be having with the app.
To clear the cache, you normally go to the Android app manager, click on the app from the list, then tap on "Clear cache." If you want to clear the cache for all your apps, you have to repeat this procedure for every single app, unless you use a cache cleaner like App Cache Cleaner.
App Cache Cleaner lists the apps on your Android device by the apps with the largest cache. You can tap on the individual apps to clear their cache, or tap on the green "Clear All" button at the bottom to clear all the caches at the same time.
If you prefer a hands-off approach to managing the cache for your apps, you can configure App Cache Cleaner to clear them at regular intervals.
App Cache Cleaner is relatively small in size and focuses on just managing the cache. If you want to try an advanced cache management app, take a look at Clean Master, which also erases Snapchat files.