In this book, we endeavor to unravel the complexities of peer pressure, drawing on insights from psychology, sociology, neuroscience, and beyond. Through a multidisciplinary lens, we delve into the mechanisms underlying peer influence, explore its developmental dynamics, and confront its implications for individual autonomy and social dynamics. From the adolescent quest for identity to the workplace pressures of conformity, we illuminate the myriad ways in which peer pressure shapes our lives and societies.