What is the difference between service orchestration and service composition?

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Martin Gilje Jaatun

Thanks, so all orchestrations are compositions, but a composition need not be an orchestration!

Remy Fannader

Composition creates a new service from different ones,

Orchestration only deals with the coordination of the activities of different services.

http://caminao.wordpress.com/how-to-implement-symbolic-representations/service-oriented-architectures/

Raphael De Aquino Gomes

Service composition is a wider term. It means that services are coordinated to achieving some goal. However, this coordination can be performed in different ways: if there is a central coordinator, the service composition is a service orchestration, and if there is no central coordinator it is a service choreography