Grid user have an illusion, that he is working on one computer system, and it is grid management software role to optimize and execution of user tasks. Thanks to its computation power, grid systems are designed to solve problems of large scale, in much wider field than supercomputers or local clusters.
Grid architecture is based on connecting different systems with different architectures, platforms, and physical localization, while maintaining local access rights and security standards.
On that basis Cloud computing grow up. A chaotic cloud of resources that can be segmented as needed:
Evolution to Cloud system could be presented on figure:
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