Abhishekam is the Hindu “ritual shower” of water, milk, honey, yogurt, and sandalwood paste that is poured over a murti (sacred image) as part of daily, weekly, or festival rites. The term was used in ancient India to mean the ritual anointing of a king and these royal meanings still attend the abhisheka rites as they are offered to the Divine.
Satyanarayan puja is done in reverence to Lord Satyanarayan - a form of Lord Mahavishnu. In this form, the lord is considered to become the embodiment of truth. The puja is a ritual performed to make sure that abundance, prosperity, general happiness as well as wellbeing prevails in the family.