Cloud computing is an emerging internet based computing technology whereby the services are provided on-demand. The cloud environment basically comprises of the cloud user, broker and the Cloud Service Provider (CSP). Cloud computing basically offers platform, software and infrastructure as its services to its user. Multiple users can access resources in cloud from different devices. The actual resources are stored in physical storage devises and are accessed by the virtual machines (VM) serving a request. These user requests are to be scheduled and provisioned in an optimum time and cost with the help of the resource broker. This paper provides a brief review on cloud computing, its types, service delivery models, cloud architecture, state-of-the-art and the research issues in cloud computing.

Cloud Service Provider (CSP), Virtual Machines (VM), Cloud Architecture, Resource Broker

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