Some websites will also use cookies to enable them to target their advertising or marketing messages based, for example, on your location and/or browsing habits.
Bydd rhai gwefannau hefyd yn defnyddio cwcis i'w galluogi i dargedu eu negeseuon hysbysebu neu farchnata ar sail, er enghraifft, ar eich lleoliad a/neu arferion pori.