By what principle does the feature work when forms are synchronously filled in different browsers?

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Jae don't know what tags to put with the question. Let's say I opened the site in two browsers. I fill out a form in one browser, and I see that the same form is synchronously filled in another browser. What is this technology and how does it work? Is the data written to the database?

Answer 1

Usually done through an intermediate server on web sockets, it is not necessary to write to the database. The principle is this: you write something in the first browser -> it is sent to the server via web sockets or just a post request -> the server sends it to all connected clients (browsers).