Big Bazaar is a retail chain founded by Kishore Biyani with 250 stores across 80 Indian cities. It targets young working women, homemakers, and middle and upper class price-conscious customers and youngsters aged 28-38. The document discusses Big Bazaar's business model, innovations like weekly deals, social media presence, competitors like Lulu Hypermarket and Reliance Retail, and marketing campaigns like those for Diwali and Republic Day.