A Web filter, which is commonly referred to as "content control software," is a piece of software designed to restrict what websites a user can visit on his or her computer. These filters can work using either a whitelist or a blacklist: The former allows access only to sites specifically chosen by whoever set up the filter, and the latter restricts access to undesirable sites as determined by the standards installed in the filter. These programs look at the URL of the desired site and search through the site's content for restricted keywords, and then decide whether to block or allow the connection. Filters are often installed either as a browser extension, as a standalone program on the computer, or as part of an overall security solution. However, they can also be installed on the network side, either by an ISP or a business, to restrict the Web access of multiple users at once. Some search engines also feature rudimentary filters to remove undesirable pages from search results.
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