Internet filters are programs that limit the use of surfing the internet. They work in many different ways. Sometimes keywords are used to block cites, and some programs have lists of undesirable cites. Depending on the program, some can be programmed to block cites chosen specifically by the user. This is often useful for parents limited the internet access they allow their children to view.
Internet filters are also useful for schools, libraries, and businesses. These different organizations sometimes want to limit what their computer users can access, so internet filtering is very important. For example, a high school computer class may block access to Facebook or other social networking websites because that is not appropriate for classroom activities. Businesses may also block websites like Facebook because that is not what they want their employees who are on-the-clock to be doing at work.
http://www.netnanny.com/
http://www.internet-filters.net/info.html
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