KitKat is a chocolate bar created by Rowntree's of York, England. Standard Kit Kat bars have two or four pieces, known as "fingers". Each finger has three layers of wafer covered in a thin coating of chocolate. Each finger can be snapped from the bar separately. Since making its first television appearance in a British advert in 1958, the slogan for the Kit Kat in the UK and elsewhere has been "Have a break... have a Kit Kat".

Source: Wikipedia