Cookies are little or big biscuits that come in chocolate ... JUST KIDDING lol
Hi neild
Cookies are small files which can be usefull and can also be used by websites to upload private information about your browsing habits. Legit websites put these on your system so when you revisit the site it reads the info in the cookie file and allows you to get access to pages more quickly, example... techspot cookeis might store info like username and password so when you revisit techspot you do not have to login each time.
so your antispyware/antivirus will delete known bad cookies that try to steal other personal info or allow hackers and other nasties to access your system.
there's more but that's the general idea.