If you’re not sure what website cookies are, there’s plenty of good content online to explain it. The Wikipedia article is a good start.
Suffice it to say that cookies are tiny files that a website places on your phone or laptop. Legislators don't like websites putting their notes on your phone or laptop without your permission. Hence since about the 2010's almost every website seems to be asking permission for these things.
Cookies are not viruses. They are not compiled computer code, can’t be executed and can’t make copies of themselves. That said, cookies can store information about your browsing preferences and history. Bad actors can use cookies to act as a form of spyware.
Essential cookies are now exempt from the requirement to get your explicit permission.
The Sons of the Most Holy Redeemer
Golgotha Monastery Island
Papa Stronsay
Orkney KW17 2AR
UNITED KINGDOM