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Wikipedia: "A SOA is a software architecture that uses loosely coupled software services to support the requirements of business processes and software users. Resources on a network in an SOA enviroment are made available as independent services that can be accessed without knowledge of their underlying platform implementation."
SOA is not that new, but it has potential to achieve some amazing things. But the organization has to be ready for it: the business has to think in processes and that's the big problem