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Libraries are always in transition mode and the libraries incapable of doing or adopting new technologies to the libraries. The present global publishing trends are making things easy for libraries to adopt or apply new technology to boost up their services. The current scenario of world library service is totally changed from traditional to technological trends. These trends sometimes called cloud computing that is making library users connected in the virtual environment. Cloud computing is the new technology to the library where its end-user can access the library without any problem at remote locations. However using or application of this technology library will face too many problems like security, the privacy of data. This paper has highlighted features, models, benefits, and challenges of cloud computing. It is sure that the libraries get resolved those issues and implement this cloud technology for better use of library data or resources.