Que is a Piglin?
Piglins are a semi-neutral mob that requries the player to wear a piece of gold armor so the piglins don't attack the player, then the player trade with the piglin with gold. Gold is what piglins absolutly admire because thats all they want. When the player gives a piglin a piece of gold then the piglin will inspect it to see if it is tradeable, after the inspection the piglin will give the player something in return. There are 18 various items that the piglin can give the player.
When were piglins released?
Piglins were added on June 25, 2020, in the version 1.16 which is also called the Nether update.