The Supreme lord descends in this world whenever there is upliftment of evil and unrighteousness, when adharma becomes more powerful than Dharma.Krishna himself says this in Bhagwadgeeta:
“यदा यदा हि धर्मस्य ग्लानिर्भवति भारत। अभ्युत्थानमधर्मस्य तदात्मानं सृजाम्यहम्।।”
He arrives to perform pastimes and protect his devotees as well as to annihilate the miscreants and re-establish and redefine Dharma.
According to Bhagwata Purana:
Athasau yuga sandhyam dasyu prayesu rajasu janita vishnu yasaso namna kalkir jagat patih (S.B 1.3.25)
Thereafter , at the conjuction of two yugas Kali and Satya ,the lord of creation will appear as the Kalki avatar and become the son of Vishnuyasha . At this time the rulers of earth will have degenerated to plunderers.
– BHAGWAT PURANA
According to Vishnu Purana ” When the Vedic practices and the institutes of law have nearly ceased to exist ,and the end of kaliyuga is near ,a portion of that divine being who exists in his divine abode and who is the beginning as well as the end and who comprehends all things, shall descend upon earth .He will be born in the family of Vishnuyasha ,an eminent Brahmana in the Sambhala village .He shall become renowned as kalki ,and shall be endowed with eight superhuman faculties. “
Similarily Padma Purana and Kalki Purana , consists of the major revealing about the Kalki avatar.
Signs of arrival of Kalki
As the age of Kali yuga advances ,people who truly possess saintly features shall gradually disappear from the face of earth .When the end will come near ,the dark influence of the KaliYuga shall become very dominant unleashing all of its evil influence .The below symptoms of Kaliyuga shall become fully visible:-
All of these symptoms are certainly visible nowdays but the actual dates and time can never be verified and it can only be sensed.
1.Religion ,honesty ,purity ,kindness ,tolerance of the people will decrease day by day.
2.Hypocrisy shall be decreased day by day .
3.People will suffer from a lack of physical strength ,weak memory and a shortened duration of life .
4.The maximum span of human life will be reduced to fifty years .
5.In the age of Kali ,wealth alone shall be considered as one’s sign of noble birth ,decent behavior and excellent qualities .
6.Might will be deemed right .Brute power will determine law and justice.
7.Men and women will live together merely because of shallow superficial reaction.
8.Business shall be conducted and success achieved based on deception.
9.Manliness and womanliness would be decided based on ones expertise in sexual intercourse course .
10.One’s hairstyle would define his beauty .
11.Filling the belly would be the ultimate goal .
12.Principles of religion will only be for sake of reputation.
By ,the end of Kaliyuga the path of Vedas shall completely be forgotten and human society will be largely athiestic and animalistic.
Deception, lying and unnecessary violence will become the primary occupation of men.
By the time lord appears ,the religious practice and the essence of Sanatana Dharma will be lost and there will be only evil people dominating in all fields . When these people are annihilated by Lord they attain the supreme liberation just like kamsa and shisupala in Mahabharata.
Hence Kaliyuga is just a chance for the evil people to commit more sins and suffer in the next birth and for the evil doers of previous birth to suffer in this yuga by the dominance of evil.
When the universe is at the end and everything is under water , then there appears a baby floating on the leaves of banyan tree , who is the almighty Narayana , in the form of Krishna. This is witnessed by sage Markandeya. The scene is truly horrific as every living creature in the universe is helplessly annihilated.
It is to signify that Lord Krishna is the only creator of universes and when the right time arrives he himself accumulate the universe within himself.