Tesco is a UK-based supermarket chain founded in 1919 that is now the largest British retailer. It initially grew on the strategy of "pile it high and sell it cheap" but later underwent a makeover to improve quality. Tesco launched initiatives like its "Every Little Helps" campaign and Clubcard loyalty program to build customer relationships. Today Tesco has over 3,500 stores across 14 countries, generating £62 billion in revenue through various store formats that cater to different locations.