Havan (also called Homa or Yajna) is a Vedic fire ritual in which offerings of ghee, grains, herbs, and other sacred materials are made into a consecrated fire (Agni) while chanting mantras. The fire is considered a manifestation of Agni, the messenger god who carries offerings to the devas (celestial beings). Havans are performed for various purposes: Ganapati Havan (removing obstacles), Navagraha Havan (planetary appeasement), Maha Mrityunjaya Havan (healing and protection), and Vastu Havan (purifying a new home). The ritual typically follows a structure: Sankalpa (intention), Agni Sthapana (establishing fire), Purnahuti (final offering), and distribution of Prasad. The sacred ash (Vibhuti) from the havan is considered blessed.