Samuel Beckett, winner of the Novel Prize for Literature in 1969, is the best known absurdist playwright. His best known play, Waiting for Godot, is known as a two-act play where nothing happens twice. In reality, it’s about two men who are waiting for a man named Godot to come, though he never does show up.
There are several ways to interpret it, from being post-apocalyptical to commenting on the nature of religion. However, at its most basic it’s about how humanity tends to wait for someone to come save them rather than saving themselves.
At its heart, theater of the absurd is based in existentialism.