Tesco plc is a British multinational groceries and general merchandise retailer headquartered in the United Kingdom at its head offices in Welwyn Garden City, England. The company was founded by Sir Jack Cohen in Hackney, London, in 1919. In 2011, it was the third-largest retailer in the world measured by gross revenues and the ninth-largest in the world measured by revenues. It is the market leader of groceries in the UK. As well as the United Kingdom, Tesco has stores in Czechia, Ireland, Slovakia, and Hungary. Since the 1960s, Tesco has diversified into areas such as the retailing of books, clothing, electronics, furniture, toys, petrol, software, financial services, telecommunications and internet services. In the 1990s, Tesco re-positioned itself from being a downmarket high-volume low-cost retailer, attempting to attract a range of social groups with its low-cost "Tesco Value" range and premium "Tesco Finest" range. Tesco is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index. Wikipedia