An agent is the unit of agentic AI. It has a goal, a way to take in information, a set of actions it can perform, and logic that chooses among them. Some agents work alone. Others coordinate as a team, each handling part of a larger task.
The value of an agent depends on its judgement and its boundaries. A capable agent that cannot explain its reasoning is hard to trust in a professional setting. A well-built agent leaves an audit trail.
Agents are how AI stops advising and starts doing.