Havan is a ritual performed with fire, in which offerings are made into a sacred fire while reciting mantras and prayers. The smoke and ash produced by the fire are believed to carry the offerings to the gods. The purpose of Vedic puja and havan is to seek blessings, peace, and prosperity, and to cultivate a spiritual connection with the divine. These rituals are considered to be important for spiritual growth and are often performed during important life events such as weddings and births. They are also performed for general well-being, to overcome difficulties, and to achieve specific goals.