First of all we should know what is cloud computing and what is the use of cloud computing. Many of new business men are using cloud computing system for their works, due to many reason like it provide data sharing, data security etc. cloud computing is like a common shelf in an office. As we all know every office consist of a shelf to store that companies data. Every person of that office can access that shelf for storing new data and referring old data for their works. But an outsider cannot access that shelf because it have lock. Same system is implemented with cloud data computing. To watch a films in our house we have two options either we can see films which is stored in our computer or we can watch it online in YouTube or in another site. Here films in our computer can be access by only me but films in YouTube can be accessed by anyone in this world. This is another advantage of cloud computing. Suppose our company have branches in many countries, if we put those data’s to cloud data, all employees in the company who has access in cloud data can use that data for their work. So a world wide data sharing is offered by cloud computing.