Āhuti is offering oblation to deities, into duly consecrated fire. It is an important part of Agnihotra and other Vedic (and also tāntric) rites. The usual procedure is to melt the butter in a pot over the gārhapatya fire, purify it by dipping two pieces of darbha-grass, fill the juhū (offering spoon or ladle) with the melted butter (called ājya) and offer it into the āhavanīya fire after first putting a samidh (sacrificial fuel) into it. ‘Svāhā’ is the mantra normally uttered by the adhvaryu while giving the āhuti.
Oblation of a larger quantity of ājya given at the end of a rite signifying its conclusion is called pūrṇāhuti.