Essentialism is the view that objects (or other entities) have at least some of their properties essentially, that these are (at least) necessary conditions for being this object, or belonging to this kind. Traditionally, anti-essentialism would then be the view that this is not so. But many who would be classified as anti-essentialists are really skeptical only about ‘real’ or mind-independent essences. Some are skeptical of modality in general, and claim that one cannot really make any sense of the essential/accidental distinction. A larger group of skeptics do not reject the distinction entirely, but see it as non-objective, as somehow a product of mental activity – this includes conventionalists, projectivists, response-dependence theorists and deflationists. Anti-essentialists are usually motivated by metaphysical concerns about the supposed nature or basis of essential properties, or the seeming arbitrariness of what falls on one or the other side of the divide, and by epistemological concerns about our ability to know that some feature is essential, often focusing on our actual practices which involve intuitions and thought experiments. Anti-essentialism concerning kinds – at least in some domains - is also sometimes motivated by Wittgenstein’s remarks on ‘family resemblance’ in the Philosophical Investigations. With Kripke and Putnam’s arguments supporting necessity a posterioriand plausible essentialist claims which could not be seen as true in virtue of meaning, essentialism experienced a resurgence which it still enjoys, both about essential properties of individuals and of natural kinds. Some subsequent anti-essentialists challenge the essentialist claims, while others accept the phenomena of a posteriori necessity and necessity de re, while attempting to understand them in a deflationary way. A more robust anti-essentialism – a denial of essences - is more common in discussion of biological and social kinds, though this sometimes is rather a denial of a specific sort of essence - for instance, a set of necessary and sufficient conditions drawn from intrinsic properties which allow for no borderline cases. Deflationist accounts of essence are also often tied to deflationary, conventional or constructivist accounts of the things which have these essences – individuals and kinds.