What are the two types of search engines according to their working methods?

Search engines can be divided into three types according to their working methods, namely, full-text search engines, directory index search engines and meta-search engines. ?

Both of them do not include the directory index, because although the directory index has a search function, it is not a real search engine in the strict sense, but just a directory list. Users don't need to search for keywords, but they can find the information they need by classifying directories. From this perspective, search engines can be divided into full-text search engines and meta-search engines according to their working methods.

Extended data:

Search engine consists of four parts: searcher, indexer, retriever and user interface. The function of a searcher is to roam the Internet, find and collect information. The function of indexer is to understand the information searched by searchers, extract index items from them, use them to represent documents, and generate the index table of document library.

The function of the retriever is to quickly check out documents in the index database according to users' queries, evaluate the relevance between documents and queries, sort out the results, and realize some user relevance feedback mechanism. The function of the user interface is to input user queries, display query results, and provide user-related feedback mechanisms.

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