Atomic Habits: An Easy & Proven Way to Build Good Habits & Break Bad Ones by James Clear is a self-help book on habit formation that shows how tiny daily improvements compound into remarkable long-term results. It introduces the idea that habits are built through a loop of cue, craving, response, and reward, and organizes practical strategies into the Four Laws of Behavior Change: make it obvious, attractive, easy, and satisfying. The book emphasizes identity-based change focusing on becoming the kind of person who naturally lives your desired habits rather than chasing goals alone.