Service Oriented Architecture (SOA) is a new architectural approach for building distributed systems that deliver application functionality as loosely coupled services. Till recently it was mere hype, but today it's a reality. The use of SOA has been moved from the laboratory level to enterprises level in order to seamlessly integrate disparate applications and create a common platform for carrying out mission critical business processes for the enterprises. The large enterprises are looking at SOA to maximize their returns by reducing complexity and cost of change and improving the leverage & reuse of assets within and outside the enterprise.