This document defines teams and their functions. It discusses defining characteristics of teams including their purpose, priorities, and decision-making processes. It also outlines different types of teams like project teams, self-managed teams, and virtual teams. The document then discusses team roles and Belbin's nine team roles. It covers teamwork processes like action processes, transition processes, and interpersonal processes. The five functions of effective teams are also defined: trust, conflict management, commitment, accountability, and focusing on results. Finally, the document outlines some common challenges teams face like lack of trust, conflict, poor change management, and role confusion.