Krishna, "the all-attractive One," specifically indicates the original, unique Supreme Personality, the source of all that exists. The names Allah, Vishnu, Jehovah, and God refer to His roles as creator, maintainer of the universe, and Lord of all, while Krishna means the complete, supreme Person as He is, and as He appears to His most dear and devoted associates.
Krishna expands into unlimited other forms of God to create and maintain the material world, while He Himself prefers to perpetually enjoy an infinite variety of loving relationships with His devotees in the spiritual world.
He visits this world from time to time to free His devotees from material existence and eliminate evildoers. On such occasions, Krishna comes either as Himself or as one of His many other avatars. He performs superhuman pastimes—lifting mountains with His pinky finger, swallowing forest fires, and killing numerous extraordinarily powerful demons, asuras—as easily as a child playing with toys.