Kalki is the tenth and final avatar of Vishnu, traditionally expected to appear in the future. Unlike the other principal Dashavatara figures, Kalki is generally understood as an avatar who has not yet manifested.
Vaishnava cosmology places Kalki’s arrival at the end of the Kali Yuga, the final and most morally degraded of the four world ages. He is expected to destroy adharma, or unrighteousness, and restore the conditions for the Satya Yuga, the age associated with truth and virtue. Textual descriptions commonly portray him as riding a white horse and wielding a sword.
The name is also written Kalkin in some transliteration systems. Details vary among Puranic and regional traditions, including his parentage, weapons, and the precise sequence of events surrounding his appearance. Another frequent confusion is Buddha: some Dashavatara lists include Buddha as Vishnu’s ninth avatar, immediately before Kalki, while other traditions use Balarama instead. The question’s phrase “yet to appear” specifically distinguishes Kalki from avatars regarded as already descended.