Unified Modeling Language (UML) is a standardized modeling language that provides a general-purpose, developmental, modeling language in the field of software engineering. Coursera's UML catalogue equips you with the skills to effectively visualize, specify, construct, and document the artifacts of a software system. You'll learn to draw different types of UML diagrams like use case, class, sequence, activity, component, and deployment diagrams. By the end of the learning journey, you will understand and apply the fundamental concepts of UML for system design, enhance your software engineering practices, and develop proficiency in using UML for both small and large system designs.