They are a textfile, saved locally to your computer, that allow the website to remember things about you between uses. They are frequently required for a site to function because the site doesn’t have a different way of remembering things about you. For example, a website you can use without an account, like a news site or a cooking site, might limit the number of articles you can read. A shopping site without cookies would mean you need to be logged in before filling your cart, otherwise it could only remember the last item you added. Things like dark mode, wouldn’t work, they’d switch off the moment you left the page. The cookies message itself requires a cookie to remember your choice.
The vast majority of cookies exist to make websites function. The only alternative is for every site to require an account before you can do anything. If your concern is privacy, allowing cookies is far safer an option then making accounts everywhere.
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