Over the last decades, semantic web has moved from the keyword based search to concept based search with various technologies like ontology and xml. ¿Knowledge based grid using semantic web¿ are designed to serve as a reference book for undergraduate and postgraduate courses. Beside this, the aim of this book is to give expertise to Research Scholars, Scientists, and the state of the art research developments in the field of knowledge based grid. This book has been composed in a straightforward and understandable way to enable the students to grasp important concepts easily. This book, organized into the seven chapters, each chapter covers a unique topic in detail viz. foundations of knowledge grid, the information retrieval from terabyte to petabyte, semantic web. This book is expected as a reference book for postgraduate and PhD level courses on semantic web. It can likewise be utilized as a supplementary reading material for undergraduate and postgraduate courses on semantic web and knowledge grid. This book deals with the technological background related to the knowledge grid at beginning how the semantic web and knowledge grid evolved.