Avira

It is a combination of artificial intelligence ,cloud technology and antivirus scanner . It protects data from trojans ,malware and spyware.
It protects all files and private data in real time ,i continuously scans your phone so as to detect any suspicious file .
You can also track your stolen phone with this app.
This app is light on system and help you save battery power .
ANTIVIRUS & PRIVACY PROTECTION

• It scans external storage for any foreign link or app ,it also rates all your apps according to privacy scale which gives you an idea about an app.
  It also blocks ransomware from taking your data besides acting as an anti theft tool also.

All pictures are taken from https://play.google.com/store/apps/details?id=com.avira.android