Final answer:
A universal agent has broad authority to act on behalf of the principal in all matters, unlike general, special, or specific agents which have limited authority.
Step-by-step explanation:
An agent that can serve the principal in any capacity is known as a universal agent. This type of agent has broad authority to act on behalf of the principal in all matters that can be delegated legally. In comparison, a general agent may have a wide range of powers but is limited to a specific type of business or activity, a special agent has the authority to act in a particular event or transaction, and a specific agent is usually synonymous with a special agent, authorized for specific tasks.