This book “Information Science: Information, Knowledge, Communication and Libraries” is a collection of 12 chapters each of which deals with a salient aspect of information Science, like: Information, Knowledge and Libraries, Information Science as a Discipline, Information and its Importance, Information and Communication Process, History of Human Communication, Properties and Behaviour of Information, Pattern of Scientific Communication, Barriers in Communication Process, Bibliometry, Sociology of Information, Economics of Information, and Information Marketing. There is also a Bibliography attached at the end.