International Journal of Information Studies Smita Panda, Amit Kumar Shaw 6 3 2000 https://www.dline.info/ijis/fulltext/v6n3/ijisv6n3_3.pdf In traditional computing, operating system would have installed software programs that manages computer hardware, resources and provides common services. Resources are accessible on one network, can’t be accessed by computers outside the network, but only through the internet. Cloud computing brings the revolutionary changes in the world of ICT because of its benefits such as reduced cost, accessible anywhere anytime as well as its elasticity and flexibility. Cloud computing is a new technique grown from being a promising concept to one of the fastest growing trend in the field of IT industry more so in libraries. Cloud computing provides us virtually unlimited and on demand computing resources to the users connecting lots of distributed computers, rather than local computer or remote server, while the processing of data centers would be more similar as internet. Thus, resources would be switched on the application of need, which could be accessed to computing and storage system as the requirement of the user. Cloud computing is useful for library services and digital library resources to improve information sharing capabilities, improve resource utilization and in meeting the various demands of user communities. This paper describes what cloud computing is for libraries and its merits, features and types to be considered before putting the data in the cloud. And few case studies are discussed.