A team is best described as a group of people with a common purpose for which they hold themselves mutually accountable. This definition emphasizes shared goals, collaboration, and mutual accountability, which are critical for effective teamwork. Teams are characterized by a collective commitment to achieve specific objectives and the willingness to support each other to ensure the group's success. Reference: "The Wisdom of Teams" by Jon R. Katzenbach and Douglas K. Smith outlines the essential characteristics and dynamics of high-performing teams.