Positive psychology is a branch of psychology that studies human thriving and optimal functioning. It emerged in the late 1990s due to the work of Martin Seligman and Mihaly Csikszentmihalyi, who were interested in moving psychology beyond a disease model and focusing more on strength and well-being. Positive psychology interventions aim to help individuals identify and build upon their character strengths and positive emotions to lead more fulfilling lives. While research is still emerging, studies show techniques like using signature strengths, practicing gratitude, and focusing on positive events can increase happiness and well-being. Critics argue that genetics and temperament limit how much people can change their baseline levels of happiness.