Information Retrieval Models and Concepts is a comprehensive book that educates on both the fundamental ideas and the rapidly expanding reach of Information Retrieval (IR) as a field. It presents an introduction to the fundamental topics underlying modern search technologies. This book includes algorithms, different data structures, indexing techniques, retrieval, and evaluation parameters. It addresses all kinds of concepts, algorithms-related IR for research purposes, especially in the Web search engine domain.||About the Author||Badal Soni is currently working as Assistant Professor in the Department of Computer Engineering, National Institute of Technology Silchar, India. All his degrees are in Computer Science and Engineering. He has over 8 years of teaching and research experience in the area of Computer Science and Information Technology with special interest in Computer Graphics, Image Processing, Speech and Language Processing. Suganya Devi K. is presently working as Assistant Professor in the Department of Computer Engineering, National Institute of Technology Silchar, India. Apart from holding various administrative responsibilities, she has organized several academic programs over the years. Besides being awarded with various awards and laurels, she has attended many seminars, FDPs, etc. She has 18 international publications to her credit and has given 15 presentations in international conferences.