In This Paper, We Examine the push Messaging Service Google Cloud Messaging (Gcm) for Android Platform. Android Platform Traditionally Keep Data Synchronization Between Android Device And Server-Side Using Method of Pulling. Each Android Device has to Poll Server for Updated Data, Which Leads to Unnecessary Network Traffic and Wastage of Mobile Phone Battery. In Order to Overcome This Weakness, Data Pushing Service, Gcm Was Introduced. Push, Describes a Style of Internet-Based Communication Where the Request for a Given Transaction Is Initiated By The Publisher or Central Server. Push Messaging is a Multi-Channel Mobile Cloud Communications Platform that Unifies Push Notifications, Sms and Instant Messaging. Gcm Service Allows Sending Data From The App Engine or Other Backhands to Android Powered Device. GCM is Lightweight Push Notification Based Service Notifying Android Application About New Data to be Fetched from the Server or Messaging Containing 4kb of Payload Data. Gcm Manages All Aspects Messages Queuing and Delivery of Message to Target Android Application Running on Target Device