The book discusses various aspects and concepts of Information Retrieval. How information retrieval relates to modern information world is beyond question. The continuously changing information environment has always been a cause as well as catalyst in information retrieval research and developments. The present book has deeply touched the information retrieval and divided the broad concept into chapters such as Overview of Information Retrieval; Query Languages and Algorithms; Boolean Logic; Statistical Models and Related Concepts; Linguistics and Information Retrieval; Methods of Information Retrieval; Performance Evaluation of Information; Retrieval Systems; Search Engines and Information Retrieval; Search Strategy and Techniques; WEB Mining; Text Mining; Data Mining and Languages; An Overview of Multimedia Information Retrieval; Information Retrieval and Digital Libraries; and The Semantic Web and Information Retrieval. The Glossary and the Index given will be helpful in understanding the concept as well as the information contained in the book.