Push notifications are brief message updates that a website or an application sends to its users. A text message or SMS is a message that a user receives on their mobile phones from a text client.
In order to receive a push notification, a user must be subscribed to the website or application push service. This is not the case for a text message.
For a text message, a mobile company charges for every mail sent. However, for a push notifications service like Truepush, push worthy updates to unlimited subscribers for $0 cost. Unlike SMS you can send rich and personalized push notifications to the users to get more clicks and engagement rates.