Every search engine must provide users with a good information query interface, which generally includes two ways of information query: classified directory and keyword. Based on the clue of resource structure, the classification catalog query classifies the information resources on the Internet according to the content level, and enables users to retrieve information according to the linear structure. Keyword query is to use the index database of network resources to provide users with query engine. As long as users input the keywords or phrases they want to find into the query box, and click the search button, the search engine will find the corresponding words in the index database according to the input questions, and perform the necessary logical operations, and finally give the hit results of the query. Users can access relevant information immediately through the links provided by search engines..<br>
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