A model is an abstract and purposeful representation of an existing or planned part of reality.
It focuses on relevant elements and omits unnecessary details. Therefore, it reduces complexity and supports clear analysis.
A model may describe the current state or define a desired future state. For example, a class diagram shows static structures. Meanwhile, an activity diagram shows processes and control flow.
Modeling languages define the available elements and rules. Their syntax controls the structure. In addition, their semantics define the meaning. However, stakeholders must also understand the notation.
Different views may represent different aspects of the same system. Therefore, teams often combine structural, behavioural, and contextual views.
Clear models support communication, requirements analysis, solution design, and informed decisions.
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