aprender c inicinates ProgMaster (1)
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说明： With intelligent databases grouped by tables and ordered according to words, the search engines form a dynamic global encyclopedia with huge storage capacity. In the literature consulted different nomenclatures are used to designate search engines. Authors such as Ledford (2008) and Enge et al. (2010), call it "search engine", but there are some authors, such as Jerkovic (2010), who use the name "search tool" and others still use only the name "search engine" or "search tool". In this work, it will be used as main term "search engine" to facilitate the understanding of the reader. According to Valdes (2007), there are differences between each mechanism
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