Brain health refers to the overall functioning and well-being of an individual's brain. It includes maintaining optimal cognitive abilities, memory retention, mental clarity, and emotional stability throughout one's life. Factors that contribute to good brain health include regular physical exercise, a balanced diet rich in nutrients, adequate sleep, stress management techniques such as meditation or yoga, social engagement, and stimulating activities like learning new things or challenging oneself mentally. Poor lifestyle choices, genetic predispositions, and aging can all negatively impact brain health, so it's important to take proactive steps towards maintaining a healthy mind throughout one's life.