A deployment diagram simply illustrates the physical implementation of the system as well as the hardware given its relationship with each other and the system which it is deployed.
Deployment diagrams show "the allocation of Artifacts to Nodes according to the Deployments defined between them."
In UML:
An artifact in the Unified Modeling Language (UML) is the specification of a physical piece of information that is used or produced by a software development process, or by deployment and operation of a system
A node In the Unified Modeling Language (UML) is a computational resource upon which UML artifacts may be deployed for execution.
Elements in Component Diagram:
1. Node: The element that provides the execution environment for the components of a system. Depicted by a cube with the name of the object in it, preceded by a colon, and underlined.
2. Connection: Similar to the relation/association used in class diagrams to define the interconnection between nodes.
Fg.3
A sample deployment diagram.
Source: http://en.wikipedia.org/wiki/Deployment_diagram
http://www.ifi.uio.no/in219/verktoy/doc/html/doc/user/mg/dgmsuml5.html
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