As far as I can see it SOA is a concept (and architecture concept) that might help you to build more agile IT and business. SOA is the concept of using services and there are several technical solutions for services, which one of them are web services.
enterprise SOA is SAP extension of SOA. enterprise SOA extend SOA by providing out of the box services for your enterprise needs (ERP, CRM, SRM, etc'). using those services you can create SOA implementation of your enterprise. Imagine that cars were build from parts rather then predefined components, how much time it would take to create a car? assembling a car from components is the same as enterprise SOA. we know what are the common IT components that enterprise use today (and we can even tune it by industry), and we use this knowledge to build all of our applications by now. the Idea behind enterprise SOA is to provide you most of the services that you need to create your SOA architecture as well as a platform to run those services.
HTH,
Natty Gur.
Bluesky
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