Social behavior is a complex phenomenon influenced by multiple factors operating at different levels. Psychologists study these levels of analysis to understand why people think, feel, and behave in social situations. Each level highlights a different source of influence, and together they provide a comprehensive explanation of human social behavior. The intrapersonal level focuses on processes occurring within the individual. It examines how personal characteristics, cognitive processes, emotions, attitudes, beliefs, motivations, values, and personality traits shape social behavior. People's perceptions and interpretations of social situations often determine how they respond. For example, stereotypes, attribution processes, self-esteem, and self-concept influence interactions with others. Cognitive biases, such as the fundamental attribution error or confirmation bias, also affect judgments and decisions in social settings. This level emphasizes that social behavior is partly determined by the individual's internal psychological processes. The interpersonal level examines direct interactions between individuals. It studies how one person's behavior influences another and how relationships develop and change over time. Topics such as attraction, communication, cooperation, competition, helping behavior, aggression, conflict resolution, and social exchange are analyzed at this level. Nonverbal communication,