A joke is when you try to aim at being funny with saying something that isn't serious or making puns, another way to describe it is the majority of this planet will never take one.
Wayne: why did the chicken cross the road
Josh: why?
Wayne: TO GET TO THE OTHER SIDE LOOOOOOOOL
Josh: what have you done..
Wayne: huh?
Josh: you're aware I'm vegan, right?
Wayne: Oh sorry dude it was just a-
Josh pulls out a gun
Wayne: OK MAN THERE'S NO NEED TO DO THIS CHILL IT WAS JUST A JOKE
Josh: in my world, there's no such thing as a joke.