Web proxy and Content Filtering Web Proxy

Web proxy:
A proxy that focuses on World Wide Web--WWW traffic is called a web proxy. Most proxy programs (e.g. Squid) provide a means to deny access to certain URLs in a blacklist.thus providing content filtering.This is usually used in a corporate environment, though with the increasing use of Linux in small businesses and homes, this function is no longer confined to large corporations. Some web proxies reformat web pages for a specific purpose or audience e.g., cell phones and PDAs.
Content Filtering Web Proxy:
A content filtering web proxy server like SafeSquid or DansGuardian helps distribute Internet access while providing control to the administrators over the content delivered.A content filtering proxy must necessarily accommodate the demands of granular rules for Internet access privileges and restrictions across an enterprise.A content filtering proxy may support authentication, to control access to the web.It usually produces logs, either to give detailed information about the URLs accessed by specific users, or to monitor bandwidth usage statistics