It's anti virus/malware also recommended,
https://play.google.com/store/apps/details?id=com.cleanmaster.mguard&hl=en (Booster/cleaner), which I installed, but after installation, I noticed that it takes up more memory that CM Security AV, so wonder how necessary, beneficial it really is.
Now remember my little android tablet just has 4G of memory and 512G of RAM, was a gift so I can't just toss it, unless it accidentally >>LOL>>falls on the pavement :-).