What was an altar originally used for?

An altar was originally used as a sacred space for offerings and sacrifices to deities in various religious practices. It served as a focal point for rituals, where worshippers would present gifts, food, or animals to seek favor, express gratitude, or atone for sins. Additionally, altars facilitated communication between the divine and the worshippers, acting as a bridge in spiritual practices. Over time, their functions evolved, but they retained their significance in many religious traditions.