An Assembly connector bridges a component's required interface (Component1) with the provided interface of another component (Component2), typically in a Component diagram.

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OMG UML Specification

The OMG UML specification (UML Superstructure Specification, v2.0, p. 143) states:

"An assembly connector is a connector between two components that defines that one component provides the services that another component requires. An assembly connector is a connector that is defined from a required interface or port to a provided interface or port."