How is the background unloading of updated data from the server done correctly?

Question

PHP

There is a website with courses, charts, etc. When updating data on the server, do you need to update the information on the page?
I think to send an ajax request every few seconds and the received data is processed, but I don’t know if this is the right decision.
How is it done correctly?

Answer 1

Google for "Long polling", "Long poll"

Answer 2

You already answered your own question. All this is done through ajax, if you need to do it without reloading the page.

Answer 3

And another option I'll throw - Web Sockets