The traditional four finger version of this chocolate bar was launched in September 1935 in the UK as Rowntree's Chocolate Crisp.
The two finger version was launched May 15, 1936. Rowntree's Chocolate Crisp was renamed Kit Kat Chocolate Crisp in 1937, and subsequently just Kit Kat after World War II.
During the war, KitKat was portrayed as a valuable wartime food and advertising described the brand as “What active people need.
In the UK, Kit Kat is the number one brand both as a confectionery item and as a biscuit. In both the US and Canada, the Kit Kat is extremely popular as one of the top ten candy bar brands.