What is an Avatar
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AVATAR is a word that is commonly heard but rarely understood. In English, the word has come to mean "an embodiment, a bodily manifestation of the Divine." However, the Sanskrit word Avatara means "the descent of God" or simply "incarnation." Here is the definition based on India's ancient Vedas, the oldest and most comprehensive spiritual literature known to man:
The Avatara, or incarnation of Godhead,
descends from the kingdom of God for [creating
and maintaining the] material manifestation.
And the particular form of the Personality of
Godhead who so descends is called an
incarnation, or Avatara. Such incarnations are
situated in the spiritual world, the kingdom of
God. When They descend to the material
creation, They assume the name Avatara.
( Chaitanya-caritamrita 2.20.263 -264)
An Avatara is a personal form of the Supreme Being and innumerable such divine forms reside in an eternal spiritual realm. When a personal form of God descends from that higher dimensional realm to the material world, He (or She) is known as an incarnation, or Avatara.