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Meta tag indexing plays an important role in organizing and categorizing web content. Specific documents often contain embedded meta information such as author, keywords, description, and language. For HTML pages, the [[meta tag]] contains keywords which are also included in the index. Earlier Internet [[search engine technology]] would only index the keywords in the meta tags for the forward index; the full document would not be parsed. At that time full-text indexing was not as well established, nor was [[computer hardware]] able to support such technology. The design of the HTML markup language initially included support for meta tags for the very purpose of being properly and easily indexed, without requiring tokenization.<ref>Berners-Lee, T., "Hypertext Markup Language - 2.0", RFC 1866, Network Working Group, November 1995.</ref>
As the Internet grew through the 1990s, many [[brick and mortar business|brick-and-mortar corporations]] went 'online' and established corporate websites. The keywords used to describe webpages (many of which were corporate-oriented webpages similar to product brochures) changed from descriptive to marketing-oriented keywords designed to drive sales by placing the webpage high in the search results for specific search queries. The fact that these keywords were subjectively specified was leading to [[spamdexing]], which drove many search engines to adopt full-text indexing technologies in the 1990s. Search engine designers and companies could only place so many 'marketing keywords' into the content of a webpage before draining it of all interesting and useful information. Given that conflict of interest with the business goal of designing user-oriented websites which were 'sticky', the [[customer lifetime value]] equation was changed to incorporate more useful content into the website in hopes of retaining the visitor. In this sense, full-text indexing was more objective and increased the quality of search engine results, as it was one more step away from subjective control of search engine result placement, which in turn furthered research of full-text indexing technologies.{{cn|date=August 2025}}
In [[desktop search]], many solutions incorporate meta tags to provide a way for authors to further customize how the search engine will index content from various files that is not evident from the file content. Desktop search is more under the control of the user, while Internet search engines must focus more on the full text index.{{cn|date=August 2025}
==See also==
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