How do people do animation in Minecraft?

First of all there are some Youtubers who somehow manage to create animations such as that so people play with it, so these Minecraft figures and then they say something and you answer and they answer you back again how does it work? Lg Laura

There's a mod called customnpc

https://www.curseforge.com/...ustom-npcs

The best thing to do is to check out a few tutorials on youtube