The origins of the “Kit Kat” brand go back to 1935, when Rowntree’s, a confectionery company based in York in the United Kingdom, trademarked the terms “Kit Cat” and “Kit Kat”. Although the terms were not immediately utilised, the first conception of the Kit Kat appeared in the 1920s, when Rowntree launched a brand of boxed chocolates entitled “Kit Cat”. This continued into the 1930s, when Rowntree’s shifted focus and production onto its “Black Magic” and “Dairy Box” brands.
With the promotion of alternative products the “Kit Cat” brand decreased and was eventually discontinued.  The original four-finger bar was developed after a worker at Rowntree’s York Factory put a suggestion in a recommendation box for a snack that “a man could take to work in his pack”.  The bar launched on 29 August 1935, under the title of “Rowntree’s Chocolate Crisp” (priced at 2d), and was sold in London and throughout Southern England. 4] The product’s official title of “Rowntree’s Chocolate Crisp” was renamed “Kit Kat Chocolate Crisp” in 1937, the same year that ‘Kit Kat’ began to incorporate “Break” into its recognisable advertising strategy.  The colour scheme and first flavour variation to the brand came in 1942, owing to World War II, when food shortages prompted an alteration in the recipe. The flavour of “Kit Kat” was changed to “dark”; the packaging abandoned its “Chocolate Crisp” title, and was adorned in blue.  After the war the title was altered to “Kit Kat” and resumed its original milk recipe and red packaging. -finger Kit Kat Following on from its success in the United Kingdom, in the 1940s “Kit Kat” was exported to Canada, South Africa, Australia and New Zealand. During the same decade Donald Gilles, the executive at JWT Orland, created the iconic advertising line “Have a Break, Have a Kit Kat”. The brand further expanded in the 1970s when Rowntree created a new distribution factory in Germany to meet European demand, and established agreements to distribute the brand in the USA and Japan, through the Hershey and Fujiya companies respectively. 2] In June 1988 Nestle acquired Kit Kat through the purchase of Rowntree’s. This gave Nestle global control over the brand, except in North America, and production and distribution increased with new facilities in Japan and additional manufacturing operations set up in Malaysia, India and China.  Variants in the traditional chocolate bar first appeared in 1996 when “Kit Kat Orange”, the first flavour variant, was introduced in the United Kingdom.
Its success was followed by several varieties including mint and caramel, and in 1999 “Kit Kat Chunky” was launched and received favourably by international consumers. Variations on the traditional “Kit Kat” have continued to develop throughout the 2000s. In 2000 Nestle acquired Fujiya’s share of the brand in Japan, and also expanded its marketplace in Japan, Russia, Turkey and Venezuela, in addition to markets in Eastern and Central Europe. 2] Throughout the decade ‘Kit Kat’ has introduced dozens of flavours and line extensions within specific consumer markets, and celebrated its 75th anniversary on 10th October 2009. The traditional bar has four fingers which each measure approximately 1 centimetre (0. 39 in) by 9 centimetres (3. 5 in). A two-finger bar was launched in the 1930s, and has remained the company’s best-selling biscuit brand ever since.  The 1999 “Kit Kat Chunky” (known as “Big Kat” in the US) has one large finger approximately 2. 5 centimetres (0. 98 in) wide.
Kit Kat bars contain varying numbers of fingers depending on the market, ranging from the half-finger sized Kit Kat Petit in Japan, to the three-fingered variants in Arabia, to the twelve-finger family-size bars in Australia and France. Kit Kat bars are sold individually and in bags, boxes and multi-packs. In Ireland, the UK and America Nestle also produces a Kit Kat Ice Cream, and in Australia and Malaysia, “Kit Kat Drumsticks”. In 2010 a new GBP 5 million manufacturing line was opened by Nestle in York, UK. This will produce more than a billion Kit Kat bars each year.