How "push notification" works realtime in ionic?

@mrossid wrote:

Dear Masters,
Could someone explain to me how “push notification” works realtime in ionic ?
i want to add “push notification” to my app but i still wondering how it works.

There are many tutorials on the internet using “BaaS” to make it “realtime” then how if my backend is not a “BaaS” ?
I mean is that a must ? Implement the realtime “push notification” using “BaaS” like Firebase or etc

Thank you.
Regards,
Newbie programmer

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