Positive psychology is the study of optimal human functioning and flourishing. It aims to understand how people thrive and focus on strengths rather than weaknesses. The pioneers of positive psychology are Martin Seligman and Mihaly Csikszentmihalyi. Positive psychology differs from traditional psychology by promoting characteristics like strengths, optimism, and good relationships that act as buffers against mental illness. Some criticisms are that it presents an overly positive view of the world and its emphasis on positivity could imply other approaches are negative. Positive psychology is applied in areas like the military, VA hospitals, and rehabilitation through building resilience, problem-solving skills, and relationships.