The principal and agent relationship is governed by vicarious liability, where the principal is responsible for the actions of their agent. This differs from the relationship between an employee and independent contractor, where the employee works under the direction of their employer, while the independent contractor works on their own terms. An agent can only perform services on behalf of their principal at one time, whereas an independent contractor can provide services to multiple clients simultaneously. The key difference lies in the level of control and autonomy each has over their work.