The short and practical answer to this questions is:
If you accept all cookies, the average website will put a cookie on your device for every one of their dozens—if not hundreds—of 3rd party “suppliers”. This allows each and every one of those 3rd parties to build a profile of you around the web, usually for advertisement purposes.
If you reject cookies, the above doesn’t happen: Cookies that are actually necessary (like remembering your session, your shopping cart, etc.) don’t need your consent in the first place.
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