English contains singular terms, quantifiers and predicates (e.g. ‘it’, ‘something’ and ‘. . . is an elephant’). But it also contains plural terms, quantifiers and predicates (e.g. ‘they’, ‘some things’ and ‘. . . are scattered on the floor’).1 Philosophers have become increasingly interested in plurals over the past couple of decades. The purpose of this article is to explain why plurals might be thought to have philosophical importance, and why they have led to philosophical debate.