A punch line is the final part of a joke that is supposed to provoke laughter. Comedians tend to tell jokes formatted in three parts: the set-up; the premise; finally, the punchline.

The punch line is the end of the joke normally a sentence that provokes laughter, it's kind of like the climax of a movie.THE BEST PART.

a punchline is like the ending part of a joke that makes it really funny. like this joke, knock knock, who's there? boo. boowho? don't cry, its just a joke. : ) A punchline can be an ironic twist, a witty observation or a jarring non sequitur. Few punchlines are inherently funny out of context, but when a comedian sets up the premise and builds up the audience's expectations, the punchline is often hilariously funny. Professional stand-up comedians may appear to be telling shaggy dog stories with no point on stage, but in reality they are either setting the audience up for a tremendous punchline or stringing together smaller jokes with the classic "set-up, punchline" format.