Data, Information and Knowledge—all are equally important and valuable in our life and needed in every spectrum of life. The Science which deals with Information (with the help of emerging Information Technologies and Computing) is called Information Science and Technology. The present book deals with several interdisciplinary features and mainly theoretical in nature. This book is helpful for the of the following Programmes: • Information Sciences (BSc/MSc) • Information Technology (BSc/MSc/ BTech/MTech) • Library Science (BLib/MLib) • Library and Information Science (BLIS/MLIS) • Computer Science (BSc/MSc BTech/MTech) • Computer Applications (BCA/MCA/BSc/MSc) • MPhil/Ph.D.