Vesak, also known as Buddha Jayanti or Buddha Purnima, is the most important religious festival in Buddhism, commemorating the birth, enlightenment, and death (parinirvana) of Gautama Buddha, the founder of Buddhism. It is celebrated by Buddhists worldwide on the full moon day in the month of Vesakha (usually in May). Vesak is observed with various religious and cultural activities, including chanting of sutras, offering alms to monks, meditation, and acts of generosity and kindness.