Cookie

A cookie is a file from a site you are visiting that gets saved on your hard disk. It is only an ID tag and there is no danger to your hard disk. It also doesn't identify you personally, just your IP - unless you give the site your personal information. You might do this if you are shopping on a site and they keep your previous purchases, shipping and credit card information for your convenience.

Affiliate programs often use cookies as well. They may use cookies to identify visitors to the site that previously visited through an affiliate link. That way the affiliate can credit for any sales. Not all affiliate programs do this, but the better ones do.

For more help with your affiliate marketing techniques, sign up for this comprehensive affiliate marketing course∞.