Unified Modeling Language, UML for short, is the international standard notation for Object-Oriented Analysis and Design (OOAD). It is a standardized specialization language that can be used for Object Modeling. It has been defined by the Object Management Group (OMG) and has already become the de-facto standard for designing Object-Oriented Software Applications. This article provides a technical overview of UML and its applicability in designing software systems and Business Process Modeling in particular.