Martin Luther King, Jr. Day, observed on the third Monday in January, honors the life and legacy of the iconic civil rights leader who championed racial equality through nonviolent protest, culminating in landmark legislation like the Civil Rights Act of 1964 and Voting Rights Act of 1965. It's a national day for service, encouraging Americans to volunteer and reflect on Dr. King's vision of justice, compassion, and community, remembering his powerful "I Have a Dream" speech and tireless work for a more inclusive America.