Maha Shivaratri is one of the biggest Hindu festival celebrated annually in honour of the god Shiva.
There are many stories and legends describing the origin of this festival.
This is celebration as day of birth of lord shiva and also shiva and Parvati got married on the same day. Also story behind was, during the samudra manthan, a pot of poison emerged from the ocean. This terrified the Gods and demons as the poison was capable of destroying the entire world, and they pray to Shiva for help and shiva emerged and drank the poison called Kalkut.

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