The definition of a push notification is a short message that pops up on the screens of various devices. They can appear on the screen of any device where there is a notification area and a possibility to display data received from the Internet.

Such notifications return the user to a site that they have already visited (and do it much more effectively than contextual advertising or any other type of mass mailing).

With push notifications you immediately receive the latest data because this technology doesn’t have a certain period of data verification, everything happens in real time.
https://multi-programming.com/for-clients/the-complete-guide-to-push-notifications-2020