The term postmodernism became popular in the 1970s and 80s but has roots reaching back through the centuries.
Social theorists usually try to define concepts through a key set of ideas and parameters. Postmodernism challenges conventional perceptions of “the definition” and few seem to clearly agree on its meaning. This is partly because postmoderns questions the very act of defining, labeling and signifying.
If postmodernism has a core idea, it might be that it paradoxically has no core idea upon which to stand. Some say that makes postmodernism absurd. But that stance seems intellectually childish. Questioning something doesn’t render the process meaningless, as amorphous as outcomes may be. Truth isn’t always black and white and only conceptual control freaks reject uncertainty.