What shape is used to represent a task in BPMN activity models?

In BPMN (Business Process Model and Notation) activity models, a task is specifically represented by a rectangle with rounded edges. This shape is used to denote the execution of a specific job or task within a process, encapsulating an atomic unit of work that needs to be performed. The rounded edges set this shape apart from other elements in BPMN, aiding in visual clarity and understanding of the process flow.

The use of the rectangle with rounded edges allows for easy identification of tasks while differentiating them from other components such as events or gateways, which have distinct shapes (like circles and diamonds). This consistent visual language enables practitioners and stakeholders to better grasp the structure and flow of business processes at a glance, which is crucial for effective communication and analysis.