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An Assembly connector bridges a component's required interface (Component1) with the provided interface of another component (Component2), typically in a Component diagram.
OMG UML Specification:
The OMG UML specification (UML Superstructure Specification, v2.1.1, p.156) 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.