Final answer:
UML is a graphical language used to visualize and specify software systems.
Step-by-step explanation:
The UML (Unified Modeling Language) is a graphical language for visualizing, specifying, constructing, and documenting the artifacts of a software-intensive system. It is commonly used in software engineering and allows software developers to create diagrams that represent different aspects of a system, such as class diagrams, use case diagrams, and sequence diagrams.