Modern kitchen stoves often have a "stovetop" or "cooktop" (American English; known as the "hob" in British English) as well as an oven. A "drop-in range" is a combination stovetop-and-oven unit that installs in a kitchen's lower cabinets flush with the countertop. Most modern stoves come in a unit with built-in extractor hoods. Professional chefs often prefer gas stovetops, for they allow them to control the heat more finely and more quickly. Today's major brands offer both gas and electric stoves, and many also offer dual-fuel ranges combining a gas stovetop and an electric oven.