What is  HAVAN/ Homam? VEDIC YAGNAS

Homams are pujas performed for a particular deity by invoking Agni - the God of fire.
It is said that when Lord Brahma (the creator among the Trinity) created man, he also created "Homam" for man's livelihood and his attainment of spiritual desires. The fundamental premise of Homam is derived from the Vedams, although, according to "Purusha Sooktham", it is the other way around - Vedams originated from Homam! Anyhow, Vedams and Homam are eternal truths having neither beginning nor end, and are "Apourusheyam" (divine, not the creation of humans). Karmam (work or action) is an integral part of living. Right and wrong Karmams can hardly be discerned by human intellect, and has to be guided by knowledge. Vedams, indeed, contain the highest form of knowledge. The singular goal of Vedam is to guide man through the correct path. And Homam forms the essence of all the Karmams prescribed in the Vedams. 

The goal of all Homams is the prosperity of the people at large by energizing and protecting the environment. The Sun is considered as the main source of energy supply, and fire is considered as a representation of the Sun's energy. According to the ancient texts on Homam, any offer to Fire as a god, is actually an offer to Sun. Any such offer is either to enrich energy in the environment or to destroy the undesirable elements in the environment, and thus, in both ways, environment is protected. Attaching divine nature to such rituals (like Homam) induced people to practice them. Thus, the ancient texts proclaim that "Such Vaidika Karmams are result-oriented, and meant to lead to Sreyass or spiritual attainments".