Krishna, “the all-attractive one,” means the original, unique Supreme Person, the source of all that exists. God has many names, and each describes a different aspect of His personality. Allah, Vishnu, Jehovah, and God refer to His roles as creator, maintainer of the universe, and Lord of all. The name Krishna suggests the most charming and beautiful qualities of the Supreme Person, as He is, and as He appears to His most dear devotees.
Krishna appears as other forms of God, avatars, to create and maintain the universe, while He simultaneously enjoys loving relationships with His countless devotees in the spiritual world. He visits this material world from time to time to free His devotees from material existence and to do away with the wicked. He performs superhuman pastimes—lifting mountains with His finger, swallowing forest fires, and killing numerous extraordinarily powerful demons, asuras—as easily as a child playing with toys.
Krishna talks about Himself in the Bhagavad-gita, explaining how anyone can know Him through Krishna consciousness, bhakti-yoga. The Srimad-Bhagavatam further describes Krishna’s uncommon and fascinating personality and activities in its Tenth Canto.