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"In the Unified Modeling Language, a component diagram depicts how components are wired together to form larger components and or software systems. They are used to illustrate the structure of arbitrarily complex systems." [Component diagram. Wikipedia]
This UML component diagram example was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Rapid UML solution from the Software Development area of ConceptDraw Solution Park.
UML component diagram
UML component diagram, work product, web-page component, library component, help file, component,

UML diagram, UML modeling Rapid UML

UML diagram, UML modeling
Rapid UML solution extends ConceptDraw PRO software with templates, samples and libraries of vector stencils for quick drawing the UML diagrams using Rapid Draw technology.
"Component diagram shows components, provided and required interfaces, ports, and relationships between them. This type of diagrams is used in Component-Based Development (CBD) to describe systems with Service-Oriented Architecture (SOA).
Component-based development is based on assumptions that previously constructed components could be reused and that components could be replaced by some other "equivalent" or "conformant" components, if needed.
The artifacts that implement component are intended to be capable of being deployed and re-deployed independently, for instance to update an existing system.
Components in UML could represent:
(1) logical components (e.g., business components, process components), and
(2) physical components (e.g., CORBA components, EJB components, COM+ and .NET components, WSDL components, etc.),
along with the artifacts that implement them and the nodes on which they are deployed and executed. It is anticipated that profiles based around components will be developed for specific component technologies and associated hardware and software environments." [uml-diagrams.org/ component-diagrams.html]
The template "UML component diagram" for the ConceptDraw PRO diagramming and vector drawing software is included in the Rapid UML solution from the Software Development area of ConceptDraw Solution Park.
www.conceptdraw.com/ solution-park/ software-uml
UML component diagram
UML component diagram,  work product, web-page component, UML component diagram symbols, library component, help file, component