The field concerned with the collection, classification, analysis, storage, retrieval and dissemination of information is referred to as information science. Some of the focus areas in this field are information access, information architecture, information society, information seeking, and knowledge representation and reasoning. The integration of library science and information science is known as library and information science. The digitization of information has impacted the approach towards libraries. Libraries nowadays have the contents of catalogs searchable online and varied search engines facilitating the search for academic resources in an easy manner. Bibliographic databases and citation indexes are the most prominent examples of information dissemination. Interactive information retrieval, digital repositories, scholarly communication and library management are some of the focus areas of this field. All these innovations have reshaped information exchange through libraries. This book provides comprehensive insights into the 21st century library, and how they facilitate information exchange. It will help the readers in keeping pace with the rapid changes in this field.