Cookies are small text files that can tell companies what you are doing online, but they don’t usually record your name or other personably identifiable information. They are used all over the Web, but in most cases, their presence is only disclosed as part of privacy policies..
Removing cookies can sometimes affect the look of a web site, but you can change the preferences or settings in your Web browser to control cookies. You can set your browser to accept cookies from the primary site, but block them from third parties. In others, you can block cookies from specific advertisers, or clear out all cookies.