The Theory of Planned Behavior is a psychological model that explains how individual behavior is influenced by intentions. It suggests that intentions are shaped by three key factors: attitudes toward the behavior, subjective norms, and perceived behavioral control. Attitudes refer to personal evaluations of the behavior, subjective norms involve social pressures or expectations, and perceived behavioral control reflects the individual's belief in their ability to perform the behavior. This theory is widely used in various fields, including health psychology and marketing, to predict behaviors such as smoking cessation, exercise, and recycling. By understanding these factors, interventions can be designed to encourage positive behaviors and discourage negative ones.