Feature wise difference between Android Nougat and Marshmallow

As manufacturers like Samsung, Sony, HTC, ZTE, etc. are busy in pushing the Android Nougat update to their latest phones like Galaxy S 7, ZTE Axon and others. The user needs to know before upgrading, what he is going to get in the new Nougat update over Marshmallow. Did i miss something in the Nougat features, leave a comment below...