 There is much more to say about the Liar paradox than we have covered here: there are more approaches to the Liar variants we have mentioned, and more related paradoxes like those of denotation, properties, etc. There are also more important technical results, and more important philosophical implications and applications. Our goal here has been to be more suggestive than exhaustive, and we hope to have given the reader an indication of what the Liar paradox is, and what its consequences might be.