Hawan-Yagya- Anushthaan is Pooja and chanting of mantra for a particular deity to please the deity by invoking Agni the fire God, and to get the blessings from them. Hawan-Yagya is like giving Dhana to the deities through fire god. It is believed that the premise of Pooja is derived from the Vedham, although, according to Purusha Sooktham it is reverse Vedham originated from Hawan-Yagya! Nevertheless, Vedhams and Hawan-Yagya are eternal truths having neither beginning nor end, and are Apourusheyam (divine, nor the creator of humans). Hawan-Yagya forms the essence of all karmas prescribed in the Vedhams. The objective of all Pooja is the prosperity of the people at large by energizing and protecting the environment. Pooja is done to please the gods.It is done for various purposes.