Abstract
Cloud computing is evolving as significant technology trend for online and on demand IT resource sharing. Cloud computing allows entrepreneurs to develop, deploy, market and sell Cloud applications worldwide without having to invest in expensive IT computing infrastructure, all these along with increase in business agility. It focuses on delivery of reliable, secure, faulttolerant, sustainable and scalable infrastructures for hosting Internet-based application services. Its overwhelming benefits include low IT overhead, reduction in overall project expenditure, greater flexibility, on demand services and pay-per-use billing model. Manifesting itself as the descendant of several other computing technologies such as Service Oriented Architecture, distributed & grid computing and virtualization, Cloud computing inherits their advancements and limitations. This paper presents key considerations related to Cloud computing, issues, opportunities and challenges involved in it.