Greenify help you identify and put the misbehaving apps into hibernation when you are not actively using them, to stop them from lagging your device or leeching the battery, in a unique way! They can do nothing without explicit launch by you or other apps, while still preserving full functionality when running in foreground.
I highly recommend this app for Android users. Many similar apps kill apps, which in fact kills your battery.
Greenify is different because it hibernates apps. When I was using my Nexus 5, I was using Greenify to improve my battery. If you are rooted, you can use Greenify on even more apps.
Hire a BuzzFeeder