Once you've upgraded your phone, you'll see the following improvements to the Android operating system and other apps on your phone.
Search from anywhere! There’s no need to leave your current app to search for the info you need next. Google Assistant uses what’s on your screen to show you related info, and even suggests next steps. For example, when composing a text to invite a friend to a particular restaurant, touch & hold
to see an info card about the restaurant (hours, ratings, distance away) and actions (open apps to navigate there or to view the menu).
Other examples:
Marshmallow includes these battery-smart features:
You can now enable battery percentage to appear on the status bar icon to see exactly how much power remains from any screen.
Manage app permissions more easily now. Permission requests now appear when you first use the app, making it clearer what the app accesses upon use. You can easily control app permissions, turning them on and off any time.