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The Web is a tremendous source of information, so tremendous that it becomes difficult for human beings to select meaningful information without support. Categorization of documents refers to the problem of automatic classification of a set of documents in classes (or categories or topics). Automatic Text Categorization is an important issue in the text mining. The task is to automatically classify text documents into predefined classes based on their content.

Automatic categorization of text documents has become an important research issue now a days. Proper categorization of text documents requires information retrieval, machine learning and Natural language processing (NLP) techniques. Our aim is to focus on important approaches to automatic text categorization based on machine learning technique.