BPMN (Business Process Model and Notation) is the open standard for modeling, visualizing, and executing business processes. What makes it different from a flowchart is that it runs. The diagram you design is the process that executes. No translation layer, no gap between what you intended and what the engine does.
BPMN was built for deterministic work: rules, sequences, human tasks, timers, error handling. It does that better than anything else, with two decades of production hardening behind it. But it had no concept of an AI agent: no way to scope what an agent can do, no inner orchestration governing the space between a decision and an action.
Camunda extended BPMN to make agents first-class participants in the process model. The result is the unified model — deterministic workflow, AI agents, and human tasks in one notation, one runtime, one audit trail.