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UML Component diagrams show the dependencies among software components, including the classifiers that specify them, such as implementation classes; and the artifacts that implement them, such as source-code files, binary-code files.
It is a simple, high-level diagram, which refers to physical components in a design. It is used to show how code is actually divided into modules. While package diagrams show logical or conceptual division, component diagrams are used to show physical division used for implementation.

A Component diagram shows the dependencies among software components, including source code, binary code and executable components. Some components exist at compile time, some exist at link time, and some exist at run time.

Components are physical units including:

The elements of the Component diagram are available in the tool bar:


                    s       Create component items. Note that components can be nested.

                    a       Create inheritance relationships between components.  

                    y       Add interface to the diagram.

                    f       Create artifact within the diagram.

                    h       Create an implementation relationship between a component and its interfaces.

                    o       Indicate dependency relationships among the diagram items.