Utility Computing

While utility computing or utility can be called with more computers to the computing resource itself. As the calculation and storage, as metered services similar to traditional public utilities (such as electricity, water, natural gas, or telephone network). This system has the advantage of low or no initial cost to get the hardware, but the computing resources are basically rented. Customers with very large computations or a sudden peak in demand can also avoid the delays that will get results from the physical and assembling a large number of computers.
"Utility computing" usually imagine some form of virtualization so that the amount of storage or computing power available would be far greater than the single time-sharing computer. Some servers are used at the end of "return" to make this possible. Maybe this is a dedicated computer cluster specifically built for the purpose of being leased out, or even an under-utilized supercomputer. Techniques to run a single calculation on multiple computers is known as distributed computing.

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Green Computing

Green computing (computing or green IT green) is based computing refers to a sustainable environment. This is "the study and practice of designing, manufacturing, use, and dispose of computers, servers, and related subsystems, such as monitors, printers, storage devices, networking and communication-efficient and effective system with minimal or no impact on Green IT environment. also seeks to achieve economic viability and increase system performance and use, while abiding by the social responsibility and ethics. Thus, the scope of green IT environment, economics of energy efficiency, and total cost of ownership, which includes the cost of disposal and recycling. This is the study and practice of using computing resource sefficiently. With the increasing recognition that human-made emissions of greenhouse gases is a major factor of global warming, corporate, government, and society in general now have important new agenda: tackling environmental issues and adopt environmentally friendly practices. Greening of our IT products, applications, services, and practices are both an economic and environmental imperatives, as well as our social responsibility. Therefore, more and more IT vendors and users move towards green IT and thus help in building a green society and economy.
The goal of green computing is similar to green chemistry, reducing the use of hazardous materials, maximize energy efficiency during the product life, and promote recyclability or biodegradability of waste products and dead plants
Green computing researchers look at key issues and topics related to energy efficiency in computing and promoting computer technology and environmentally friendly energy systems, including efficient use of computers, design of algorithms and computer systems for environmentally friendly technologies, and other related topics

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