Tracking cookies are used by many types of sites to determine where you may have surfed, which pages you visited, and what ads you may have been shown.
Cookies are also used to remember logins on certain webpages such as Google, Yahoo and MSN. Cookies can also be used to save user preferences and options so the site can identify you the next time you visit and customize the site to your personal configuration. You may wish to trust those cookies detected by SUPERAntiSpyware if they belong to sites you trust or turn off Cookie scanning in the Preferences of SUPERAntiSpyware.
Cookies by themselves are not harmful as they are simple text files or text representations of data.