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Who may enjoy this article?
This article will interest you in case:

• You want to understand if you need to use push notifications in your app or not;
  
  
• You want to make up your mind what service is the most suitable for your app;
  
  
• You look for Parse alternative.
  https://steelkiwi.com/blog/push-notifica...to-choose/
  

Push notification, also called server push notification, is the delivery of information from a software application to a computing device without a specific request from the client.

Unlike pull notifications, in which the client must request information from a server, push notifications originate from a server. Typically, the end user must opt-in to receive alerts; opt-in usually takes place during the install process and end users are provided with a way to manage alerts if they change their minds later on.
An important advantage of push notifications in mobile computing is that the technology doesn't require specific applications on a mobile device to be open in order for a message to be received. This allows a smartphone to receive and display social media or text message alerts even when the device's screen is locked and the social media application that is pushing the notification is closed.