From mcafee.com
On the internet, the Domain Name System (DNS) is the way regular people access websites such as ESPN.com or BBC.com. However, the internet uses a unique series of Internet Protocol (IP) addresses to access websites which are tricky for humans to remember. Web browsers typically interact with websites through IP addresses, and DNS translates websites into IP addresses so browsers can access Internet resources. Historically, this has been done in the form of unencrypted clear text that ISPs and security providers such as McAfee can read and act upon to sort through risky websites or to improve network performance and intelligence.