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UML is a standard language for specifying, visualizing, constructing, and documenting the artifacts of software systems. UML was created by Object Management Group (OMG) and UML 1.0 specification draft was proposed to the OMG in January 1997. OMG is continuously putting effort to make a truly industry standard. UML stands for Unified Modelling Language. UML is different from the other common programming languages like C++, Java, COBOL etc. UML is a pictorial language used to make software blue prints. So UML can be described as a general purpose visual modelling language to visualize, specify, construct and document software system. Although UML is generally used to model software systems but it is not limited within this boundary. It is also used to model non software systems as well like process flow in a manufacturing unit etc. UML is not a programming language but tools can be used to generate code in various languages using UML diagrams. UML has a direct relation with object oriented analysis and design. After some standardization UML is become an OMG (Object Management Group) standard. A picture is worth a thousand words, this absolutely fits while discussing about UML. Object oriented concepts were introduced much earlier than UML. So at that time there were no standard methodologies to organize and consolidate the object oriented development. At that point of time UML came into picture. There are a number of goals for developing UML but the most important is to define some general purpose modelling language which all modelers can use and also it needs to be made simple to understand and use. UML diagrams are not only made for developers but also for business users, common people and anybody interested to understand the system. The system can be a software or non software. So it must be clear that UML is not a development method rather it accompanies with processes to make a successful system. At the conclusion the goal of UML can be defined as a simple modelling mechanism to model all possible practical systems in today.s complex environment. To understand conceptual model of UML first we need to clarify What is a conceptual model? and Why a conceptual model is at all required?
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