Mahakala is a male Buddhisttantric deity. He is the protector deity known as a Dharmapala in Vajrayana Buddhism, especially most Tibetan traditions, in Tangmi and in Japanese Esoteric Buddhism.
Maha literally translates as great and Kala signifies time or death, hence Mahakala means "beyond the time" or "Great Black One".
Mahakala is a protector deity and specifically the primary Wisdom Protector of Himalayan and Tibetan Buddhism. In some cases, Mahakala can also be a meditational .