Android 5.1 vs Android 6: App Info
In Android 5.1 Lollipop and all versions before it heading into "Apps" in the settings menu would show you all apps, but separate them by downloaded apps, running apps, or all. Now, with Android M they're all in one huge list and clicking any specific app will show you tons of information about it.
Apps are easier to look through, manage, disable or uninstall, and tapping any app in "Apps" will give you a completely new set of information. You can see the storage usage, data, have complete control of permissions, control the notifications or stop them, set app defaults and more. Basically the "Apps" menu is extremely powerful and gives users complete control of apps, what they do, and more. It even shows how much battery each app has used, simply by tapping on any specific app.
Everything is now in one area for each app, easy to see, manage, and control. It's all about simplicty here.