If you have an android tablet do not install a keyboard called cheetah or its themes on it. Cheetah keyboard and it's themes have extremely obnoxious and aggressive ads that will take over your tablet and make it impossible to use it. The keyboard abnd it's themes have what may be cumlative ads that will lock up your tablet with loops of ads that literally hijack it to nothing but ads.
I had this happens while searching for a better keyboard app and it lasted till I deleted every cheetah keyboard related app. Now it's fine.