A keyword in Information Retrieval is a term that captures the essence of the topic of a document or a search query. When a descriptor is descriptive, it could be an successful search parameter.
It is used to get back documents in an information system, for example a catalog or a search engine. It can consist of: a word, phrase, or alphanumerical term. Keywords are formed by examining the document either manually with subject indexing or automatically with full text indexing or more sophisticated methods of keyword extraction. Keywords are stored in an Index.
Articles (a, an, the) and conjunctions (and, or, but) are not treated as keywords because it is inefficient to do so. Almost every English-language site on the Internet has the articles “a, an, the”, and hence it makes no sense to search for it.
Google removed Stop words such as “the” and “a” from its indexes for several years, however then re-introduced them, making certain types of precise search possible again.
The term “descriptor” was make up by Calvin Mooers in 1948. A popular form of keywords on the web are tags, which are directly visible and could be assigned by non-experts also.
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