Caution: while removing books from Kindle retains annotations and highlights in the Amazon cloud, uninstalling apps can permanently erase your saved data (player scores, profiles…)
Note: since Amazon knows which apps you purchased, you can re-download them later, and at no cost. But your data won't be restored unless that app stores it in an online database.
Caution: although you can regain some space by tapping on the corresponding "Clear Data" or "Clear Cache" buttons, we don't recommend it, unless you know from good source what the impact will be on the app. If needed, contact the application's developer.