Individuals these days want to store their personal data in a place where they can access the data anytime, from anywhere and from any electronic gadget like PC, tablet, phone etc. They also want a reliable storage which provides synchronization, backup facilities. Also, enterprises are in need of a storage service provider to relieve them from the establishment and maintenance problems of storage servers and networks. The major advantage of using cloud storage services is that at any instant of time, the storage requirements can be changed according to the user requirements hence saving cost. This paper is focused on introducing the basics of cloud computing, and the challenges that need to be encountered in providing cloud storage services. Some of the major commercial cloud storage providers like Amazon, Google, Dropbox, Microsoft and Apple have been discussed. A critical review has been performed and a comparison table has been framed comparing the major features of the selected commercial cloud storage providers.
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