The UML is a Language.

The UML is a Language:

• A modeling language is a language whose vocabulary and rules focus on the conceptual and physical representation of a system

The UML is a Language for Visualizing:

• Some programmers think of an implementation and then code it. Some programmers think mentally i.e. they even sketch out a few ideas on a paper. That means some things are best modeled textually, others are best modeled graphically. The UML is such a graphical language.

The UML is a Language for Specifying:

• Specifying means building models.  It specifies of  all the important analysis, design, and implementation decisions that must be made in developing a software project.

The UML is a Language for constructing:

• The UML is not a visual programming language, but its models can be directly connected to a variety of a programming language. 
• This means that it is possible to map from a model in the UML to a programming language such as Java, C++.

The UML is a Language for Documenting:

• A Healthy software organization produces all sorts of artifacts in addition to raw executable code. These artifacts include

    1.Requirements.
    2.Architecture.
    3.Design.
    4.Source code.
    5.Project plans.
    6.Tests.
    7.Releases.

• The UML addresses the documentation of a system’s architecture and all of its detail.