What is push notification or push messaging?

I recently bought a new iPhone. I'm trying to find good apps that fits to my everyday work. I discovered this push messaging apps. Is this apps safe to use? What is the benefit of this application?

A 'Push Message' is basically the Apple name for a notification, on a app, it will send you notifications e.g. Someone sent you a message, it will send an alert, and when opened it will go to that app/extension. But, push notifications can only be used with wi-fi/3/4g and drain battery, aside from that, safe as houses: D

Push Notification is a tool designed for iPhone app users that notify or alert them when new information or action is arrived. Push application acts as a server between mobile phone developers, Apple and iPhone users. With this app, you as a mobile phone user or app developer can cut the producing and maintaining your own Push Messaging server and save time and money.

You can send push notification messages to unlimited iPhone devices for free.

  • Why doesn't my iPhone 3GS Push notifications work? My fiancé got me a used 3GS (times are hard) and ever since I've gotten it my notifications will not work. The notification buttons are all on. Even when I turn them off and then back on they still won't work. My fiancé is a computer wiz and told me not to restore my iPhone what so ever. Everything is on and sound is great just the push notifications won't work.
  • Push Notifications, iPhone 4S? How do you get push notifcations for Tumblr? Like, when someone reblogs something, likes something, asks a question follows you, is there a way I can get my iphone to notify me without actually having to click on the app?
  • Not receiving push notifications on Iphone? I'm not receiving push notifications from Whatsapp anymore on my Iphone. Now, I have to actually open Whatsapp and then the message will be delivered to me, only for me to realize it was sent like 20 minutes ago or however long. Any ideas? All the settings are on, the whatsapp notifications settings are all correct. I've reinstalled the App and even restored my phone to factory settings, and nothing…
  • Is MMS messaging free with unlimited SMS text messaging with a T-Mobile iPhone? I have unlimited texting(SMS) and I just recently turned on my picture text messages (MMS) settings for my iPhone. I was wondering if I have to pay for MMS for every incoming or outcoming pic, or does it count as unlimited texting too? I pay for my internet too, if that helps with anything: P