Mostly are entirely harmless, but some websites use cookies that track your activity on the internet.
I always follow the principle that if you don't need something on your pc then don't have it so I block cookies completely unless I am purchasing something from a trusted company that requires them to make a transaction.
Sounds like you are another one who would benefit from having Piriform's CCleaner.
It will wipe out your cookies, but can be set to keep the ones you want.
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