Cloud computing systems are divided into two different sections, the front end and the back end. These both connect to each other through a network. The front end is the end the client sees and the back end is the "cloud" section of the system. The front end includes the users computer or computer network and the application required to access the "cloud". The back end of the system consists of various computer servers and data storage systems. This creates the cloud computing system.
A central server administrators the system. this means that the administrator monitors traffic and client demands to make sure everything is running correctly. The cloud computing system also has a protocol and uses middleware. Middleware allows networked computers to be connected. The cloud can sometime break down so copies of all of the data is made in order to recover data. The cloud actually has many different uses. Cloud computing systems allows clients to access apps from anywhere at anytime. Costs of hardware goes down as well because the cloud reduces the need for advanced hardware. It also gives companies the option to store data on someone else's hardware.
Source: http://computer.howstuffworks.com/cloud-computing/cloud-computing1.htm
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