Cookies are generally a way for websites to remember something. This includes whether you have logged in. So one required cookie could be a session token indicating that you have logged in. To get this to work without cookies you would have to log in on every page visit.
Webpages that are the same no matter what you have done before do not need cookies, but anything that requires a website to remember what you have done *cannot* be accomplished without cookies or something similar (local storage, I.P. address, device ID).
Cookies are not inherently evil and don’t always have anything to do with tracking private information, they usually are just a way of storing user state between requests so that the website can do its desired function. You *can* set browser settings to completely block cookies, but many webpages simply won’t work.
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