There are four main types of search engines: crawler based search engines that use algorithms to find and index web pages; human powered directories that are manually organized; hybrid search engines that combine automated and human-powered methods; and meta search engines that search results from multiple other search engines. The document also advertises learning more about search engine types and optimization from Surya's International Inc.

1. TYPES OF SEARCH ENGINES Surya’s International Inc

2. The four types of Search Engines most widely used are. . . Crawler based Search Engines Human powered Directories Hybrid Search Engines & Meta Search Engines

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