Dwapar Yuga
Dvapara Yuga or Dwapara Yuga(Gurmukhi:ਦਆਪਰ ਜਗ) is a Yuga of Jeev Atma, when it is in Mother's Womb. Dwapar means the Jeev Atma when leave one world it enters in second world. we are actually away from our Mool. When Jeev Atma is thrown away from Sachkhand, it comes in womb to take birth. The time he stay in Womb is called Duapur after that Kalyug Starts.
Yugs are conditions of Heart or Jeevatma.
Etymology
Dua + Pur = Some Other + World i.e The Jeev Atma has thrown out from Sachkhand and it have to go into his base, to merge in immortal. That age when it merge in immortal god, stay in SachKhand, that Yuga is called Satyug.
What happens in Dwapar Yuga
ਦਆਪਰਿ ਦੂਜੈ ਦਬਿਧਾ ਹੋਇ ॥
Th Second World, duality and double-mindedness arose.
ਭਰਮਿ ਭਲਾਨੇ ਜਾਣਹਿ ਦੋਇ ॥
They both knew about God
ਦਆਪਰਿ ਧਰਮਿ ਦਇ ਪੈਰ ਰਖਾਝ ॥
In this Brass Age, Dharma was left with only two feet.
ਗਰਮਖਿ ਹੋਵੈ ਤ ਨਾਮ ਦਰਿੜਾਝ ॥੩॥
Those who became Gurmukh implanted the Naam deep within. ||3||