Unified Modeling Language (UML) is a standardized way to visualize the design of a system. It provides a set of diagrams and symbols that help developers and stakeholders understand how different parts of a system interact. By using UML, teams can create clear blueprints for software projects, making it easier to communicate ideas and requirements. UML includes various types of diagrams, such as class diagrams, use case diagrams, and sequence diagrams. Each type serves a specific purpose, like showing the structure of a system or illustrating how users will interact with it. This helps ensure everyone is on the same page during development.