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Restrict information accessible by web browsers and mail readers
With the exponential growth in World Wide Web use, there has been a corresponding increase in the risks associated with web content. Similarly, the growth in email has been accompanied by an avalanche of spam.
Web filtering—controlling a user's access to web content—has become an important, if sometimes controversial, capability. Though in some contexts it might constitute censorship, within a business context it can represent legitimate control of an employee's activities. And if you're building a product that will provide a web-based interface for children, then controlling what sites they can access is probably a requirement.
Just as email spam has become more insidious, filters that can block spam have become more capable. SpamAssassin is a widely used spam filter that employs multiple strategies for identifying and blocking spam.