Unified Modeling Language or UML is the standard language for describing, visualizing, and documenting the object-oriented (OO) systems. UML is a collection of a variety of diagrams for different purposes and each type of diagram models a particular aspect of OO design in an easy to understand and visual manner.
The UML standard specifies exactly how the diagrams are to be drawn and what each component in the diagram means. UML is not dependent on any particular programming language, instead it focuses one the fundamental concepts and ideas that model a system.
It is a standardized language in which to specify the artefacts and components of a software system, how the diagrams are to be drawn and what each component in the diagram means. It is important to understand that the UML describes a notation and not a process. It does not put forth a single method or process of design, but rather is a standardized tool that can be used in a design process.
The UML gives everyone from business analyst to designer to programmer a common vocabulary to talk about software design.
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