Cognitive Computing and Behavioral Systems seek to build computational models that emulate human thought, learning, perception, and behavior. These systems integrate neuroscience, psychology, machine learning, and computational linguistics. Cognitive architectures enable machines to reason, plan, and adapt similarly to humans. Behavioral modelling captures decision-making processes, emotional responses, and social interaction patterns. Intelligent agents personalize interactions based on user intent, context, and affect. Applications range from mental health diagnostics and adaptive tutors to empathetic robots and behavior-aware virtual assistants. Multimodal signals-speech, facial expressions, physiological data-inform models of human cognition and emotion. The field bridges biological intelligence and artificial intelligence, supporting more intuitive, human-centered technological experiences. As cognitive computing progresses, it deepens our understanding of the human mind and enhances human-machine synergy.