Drop cookies are a style of cookie, made from a relatively soft dough that is dropped by spoonfuls onto the baking sheet. During baking, the mounds of dough spread and flatten.
Chocolate chip cookies, oatmeal raisin (or other oatmeal-based) cookies, and rock cakes are popular examples of drop cookies. This may also include thumbprint cookies, for which a small central depression is created with a thumb or small spoon before baking to contain a filling, such as jam or a chocolate chip.
In the UK, the term "cookie" often refers only to this particular type of product.