What is the Tsar Bomb nuke test?

1.Russia recently released a documentary video of this test.
2.The scientific name of the bomb is RDS-220. Nickname is Tsar Bomba. This is a large nuclear weapon
3.Yield is this bomb is 50 megatons. Equal to around 3,800 Hiroshima bombs. The weapon was set over Novaya Zemlya on the date of October 30, 1961.