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In page Cookie:

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A general theory of cookies may be formulated in the following way. Despite its descent from cakes and other sweetened breads, the cookie in almost all its forms has abandoned water as a medium for cohesion. Water in cakes serves to make the batter as thin as possible, the better to allow bubbles—responsible for a cake's fluffiness—to form. In the cookie the agent of cohesion has become some form of oil. Oils, whether in the form of butter, vegetable oils, or lard, are much more viscous than water and evaporate freely at a far higher temperature. Thus a cake made with butter or eggs in place of water is much denser after removal from the oven.[citation needed]