Natural language processing is a field of research which deals with the interactions between human languages and computer. It also deals with the process of programming computers to analyze and process natural language data on a large scale. It is considered to be a subfield of several different fields such as artificial intelligence, computer science and linguistics. Computational linguistics is an inter-disciplinary field which uses a computational perspective to deal with statistical modeling of natural language. It has two main components, namely theoretical and applied. Theoretical computational linguistics is devoted to the study of issues in cognitive science. Applied computational linguistics, on the other hand, deals with the practical outcome of modeling human language use. This book discusses the fundamentals as well as modern approaches of natural language processing and computational linguistics. Those in search of information to further their knowledge will be greatly assisted by this book. It is appropriate for students seeking detailed information in this area as well as for experts.