McClelland's Theory of Needs is a psychological framework that identifies three primary needs that drive human motivation: the need for achievement, the need for affiliation, and the need for power. The need for achievement focuses on personal success and setting challenging goals. The need for affiliation emphasizes the importance of social relationships and belonging, while the need for power relates to the desire to influence or control others. According to this theory, individuals are motivated by different combinations of these needs, which can affect their behavior in personal and professional settings. Understanding these needs can help in managing teams and improving workplace dynamics.