The word cookie means “small cake,” and that’s exactly what a cookie is. In fact, some cookies are made from cake batter. Some products, such as certain kinds of brownies, are difficult to classify as cakes or cookies.
Most cookie formulas, however, call for less liquid than cake formulas do. Cookie doughs range from soft to very stiff, unlike the thinner batters for cakes. This difference in moisture content means some differences in mixing methods, although the basic procedures are much like those for cakes.