The term is frequently used in modern culture for an action or idea that is expected or predictable, based on a prior event. Typically pejorative, clichés are not always false or inaccurate; a cliché may or may not be true.
You probably knew most of this, but what you probably didn’t know is that the word is an onomatopoeia! Representing the sound of a printing press. Just try not to go around bragging about it's origin, or it might soon become very cliché.
What's your favourite?