Who is Kalki avatar?

The Kalki Avatar is the final incarnation of Lord Vishnu according to the Puranas. The Kalki Avatar is prophesied end the Kali Yuga, one of the four periods in the endless cycle of existence

Kalki is described in the Puranas as the avatar who rejuvenates existence by ending the darkest and destructive period to remove adharma and ushering in the Satya Yuga, while riding a white horse with a fiery sword.

For further reading check the following articles:

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