Origin Of durga and Mythology

Durga, a beautiful warrior seated upon a tiger.
Devi is the great goddess of the Hindus,the consort of Shiva and she is worshiped in various forms corresponding to her two aspects: benevolence and fierceness. She is Uma, "light"; Gauri, "yellow or brilliant"; Parvati, "the mountaineer"; and Jagatmata, "the-mother-of-the-world" in her milder guise. The terrible emanations are Durga "the inaccessible"; Kali, "the black"; Chandi, "the fierce"; and Bhairavi, "the terrible."
She went to battle on her ferocious mount lion, armed with the weapons given to her by the other Gods. Durga is one of the angry and aggressive aspects of the goddess Shakti, whose role in Hindu mythology was to fight and conquer demons and also personify the Sakti or female aspect of any male deity. In the battle, she fought and killed the evil Mahishasura and restored heaven to the Gods. Since then the goddess is invoked for protection from the powers of evil. Durga Puja is observed in her honor, to celebrate her victory over evil.