"The Happiness Project" by Gretchen Rubin is a transformative self-help book that documents the author's year-long quest to increase her own happiness and overall sense of well-being. Through a series of practical experiments, Rubin explores various aspects of her life, from relationships and work to health and leisure, in order to cultivate greater joy and contentment. By blending personal anecdotes, scientific research, and actionable advice, the book offers readers a roadmap to finding happiness and making positive changes in their own lives.