What is push notification
Push notification is quite simple really. Data is pushed from Android or Apple to your mobile phone. When you look at your phone and see that you have updates from Facebook, that happens using push notification. Both Apple and Android have push notification. I do not know if Windows phone has it but I'm guessing it does. The process is implemented using a central service. The application on the device tells the operating system it wants push notifications. Also, push notification has to be enabled at the provider. This means setting it up in Apple or Google. Once this is done, the application, operating system (iOS or Android), the push notification service(Apple or Google) and the source of the messages work together to send messages to your Android or iPhone.