Messages are brief news updates that a website or application sends to its users through a server (and using push technology). A text message is a message that a user receives from a text client on their mobile phone.
In order to receive a push notification, a user must be subscribed to the respective website or application, which is not the case with a text message.
For a text message, a cell phone company charges a fee for every email it sends. However, for a push notification service like Truepush, you can send valuable updates to unlimited subscribers.