Learned optimism is a scientifically validated psychological framework developed by Martin Seligman that demonstrates how individuals can cultivate a more positive perspective through understanding and modifying their explanatory style—the habitual way they explain life events to themselves. Unlike innate personality traits, explanatory style is learned and thus changeable, operating through three key dimensions: permanence (temporary vs. permanent causes), pervasiveness (specific vs. global impact), and personalization (external vs. internal attribution). Research confirms that optimistic explanatory styles correlate with improved mental health, stronger immune function, enhanced cardiovascular outcomes, greater resilience to adversity, and even increased longevity. The critical distinction from toxic positivity lies in flexible optimism—maintaining hopeful expectations while acknowledging reality, preparing for obstacles, and adjusting perspectives based on context rather than denying negative emotions or valid concerns.