Content filtering (also known as information filtering) is the use of a program to screen and exclude from access or availability Web pages or e-mail that is deemed objectionable.
Content filtering works by matching strings of characters. When the strings match, the content is not allowed through.
URL filtering limits access to specific URLs by comparing addresses of sites that users are attempting to visit against a database of either permitted or blocked sites..
Content filtering, in the most general sense, involves using a program to prevent access to certain items, which may be harmful if opened or accessed. The most common items to filter are executables, emails or websites. Content filters can be implemented either as software or via a hardware-based solution
Content filtering works by matching strings of characters. When the strings match, the content is not allowed through. Content filters are often part of Internet firewalls. In such a usage content filtering is serving a security purpose, but content filtering is also used to implement company policies related to information system usage. For example, it's common to filter websites containing pornographic materials or social-networking sites unrelated to work.
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