How to make page changes in real time?

Question

JavaScript

Right now I was making a form, by clicking on which the data was changed without reloading the page, i.e. ajax. But it turns out that changes occur only for this user, other users will have to reload the page, for example. But how to make, for example, one user changed something on the page and this change affected all users? In which direction do you need to "dig"?)

Answer 1

Websockets or push notifications.