What exactly does form action do?

This is a really dumb question but what exactly happens when a user submits form input after clicking the submit button?

Like… where does it go?

I know technically it goes to the link the action points to, but how does it get there? Does it just show up as plaintext or something?

It needs a backend to be stored. If it doesnt have that, it just simply goes no where

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Your form information will be sent to the server script via query string attached to the end of your http address.

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Hmm I never wonder under which kind of format the data are send I just know that we can access data or variable name in the page action points to. But for the answer on your title question: action attribute defines a target page for processing form data, page where you can choose what to do with what you receive: check the validity, store into a database, etc