How to Enable Google Drive API Version 3 for your application? Google REST APIs is a set of Application Programming Interfaces (APIs) developed by Google. Which allow communication with Google services and their integration with other services. Example of these includes Search, Gmail, Google Drive & much more. Here REST stands for Representational State Transfer. This type of API relies on stateless, client-server, cacheable communication protocols. & Rest APIs commonly use HTTP protocols.Google Drive API is one of the popular API. Users can integrate google drive with their apps through APIs. There are many apps available for collaborative document creating, editing(Google Docs, Sheets) & storage there personal or official documents.