Peer pressure is the influence of one's peers on an individual's behavior, attitudes, or beliefs. It can be positive or negative, and it can affect individuals in many ways. Positive peer pressure can encourage healthy habits, such as exercise or eating well, while negative peer pressure can lead to risky behaviors like drug use or unsafe sex. Peer pressure can also have a significant impact on mental health, with some individuals feeling pressured to conform to societal norms or fit in with their peers.