A group is defined as three or more individuals who interact or cooperate in various contexts, fulfilling interpersonal needs through both primary and secondary groups. The document discusses the life cycle of groups, outlining stages such as forming, storming, norming, performing, and adjourning, as well as typical member roles and the importance of group discussions. Additionally, it presents a seven-step problem-solving approach for groups and emphasizes the dynamics of group interactions and the significance of effective communication skills.