Happiness science examines the predictors, components, and cultivation of subjective well-being through empirical research methods. Emerging from positive psychology in the late 1990s, this interdisciplinary field explores both hedonic (pleasure-based) and eudaimonic (meaning-based) pathways to flourishing. A critical insight: while genetics and circumstances set boundaries, approximately 40% of lasting happiness derives from intentional activities—making well-being substantially modifiable through evidence-based practices rather than passive life events alone.