This book has been written with the aim of empowering students to use specialized resources in Knowledge and Information Science Studies, ease of working with information and communication networks, acquainting students with specialized terms for searching and retrieving English resources. The target audiences of this book are undergraduate students in the Major of Knowledge and Information Science Studies and Medical Library & Information Science and postgraduate students in all fields of Knowledge and Information Science Studies. This book contains thirteen units: Information and Communication Technology, Digital Libraries, Information Systems, Information Search and Retrieval Systems, Databases, Library Social Services, Information Flow, Professional Organizations, Information Marketing, Information Behaviours, MESH, The Role of Librarians in Health Science and Medical Informatics,