Menaka SRadha N2020-09-072020-09-072013-072231-2803http://www.ijcttjournal.org/Volume4/issue-7/IJCTT-V4I7P164.pdfhttps://dspace.psgrkcw.com/handle/123456789/1320Keywords are a set of major words in a document that give high-level description of the content for readers. Keywords are useful for scanning large documents in a short time. Extracting keywords manually are very difficult and time-consuming process. Therefore, there is in need for process to extract keywords from documents automatically. Keyword extraction is a process in which a set of words are selected that gives the meaning of the whole document. This paper presents an overview of techniques used for keyword extraction.enTF-IDFClassificationLexical chainWordNetArticle