Update 6/27: The Google Awareness API is now available to all developers as part of Play Services 9.2. Using seven types of context, apps can intelligently react to what users are doing. The Snapshot ...
Think of a REST API like a waiter in a restaurant. You (an app) tell the waiter what you want (your request), and the waiter goes to the kitchen (the server) to get it for you. REST is just a set of ...