What is an Avatar (Incarnation)?

Almost all Hindus believe in this concept of Avatar. Avatar happens when GOD (Bhagwan) himself comes down to earth in human form as male or female. This happens whenever righteousness declines and wickedness is rules, thus threatening the existence of GOD-loving and virtues people. Popular Avatars (incarnation) of GOD like Ram and Krishn destroyed wickedness and re-established righteousness by exemplifying ideal behavior and restored peace and love amongst society. It is stated in Hindu scriptures that GOD takes infinite incarnations time and time again. There are number of universes where this continues to happen again and again. This is also in accordance with science with concept of parallel universe mentioned by no other than Albert Einstein.