Grid computing is a phrase in distributed computing which can have several meanings: Multiple independent computing clusters which act like a "grid" because they are composed of nodes not located within a single administrative domain or at a single geographical location.* Offering online computation or storage as a metered commercial service, known as utility computing, computing on demand, or cloud computing.* The creation of a "virtual supercomputer" by using spare computing resources within an organisation; The creation of a "virtual supercomputer" by using a network of geographically dispersed computers. Volunteer computing, which generally focuses on scientific, mathematical, and academic problems, is the most common application of this technology. This book presents leading research from around the globe.