With the development and increasing popularity of information technology, how to effectively receive and manage the information from the internet becomes a more pronounced problem. According to certain standards, users can take some methods of information filtering to block the information they do not want and retrieve the information they want. In this way, people can effectively avoid false information, spam, commercial advertising, insulting, internet attacks, pornography, and other internet problems. This paper focuses on information filtering systems against information pollution and crime, describes the characteristics and methods of information filtering, and introduces some information filtering software.
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