Kalratri

Kalratri ( dark as night) represents time and the changing aspect of nature that bring things to life or death identified with the Ultimate reality . She is also the feminine form of Kāla, She is the consort of Shiva or Kala - Time (which is interpreted also as Death), kali is depicted as Devi in her universal form as Shakti. She serves as the agent who allows the cosmic order to be restored.She is also seen as divine protector and the one who bestows moksha, or liberation.
In popular story-telling, the reason for Kali sticking out her tongue is rather domestic. After killing the demon Daruka, Kali drank his blood. The blood drove her mad with bloodlust. She went around the world killing at random. The gods begged Shiva to stop her. So he took the form of a handsome man and lay in Kali's path. As soon as Kali stepped on him, she bit her tongue out of embarrassment. She was ashamed to learn that her bloodlust had prevented her from seeing and recognising her own husband.