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The implementations of components, either individual or composite, all form reusable units that can be run multiple times in different environments (in much the same way as you have multiple instances of a Java class). A composite, with its configuration information, gets packaged into a deployable unit called a contribution which gets contributed to the domain. Artifacts may be shared between contributions, for example Java classes, XSD files, WSDL files,etc.

An SCA Domain represents the SCA runtimea complete runtime configuration, potentially distributed over a
series of interconnected runtime nodes. Domain configuration is the overall configuration for service dependencies, properties, policies. A domain is a logical view of the running applications or a coherent grouping of components that are working together, connected to each other using SCA wiring. The composites get A composite gets instantiated when it is actually used in an SCA environment.

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