Retailers buy products from wholesalers and sell them in smaller quantities directly to end-users. They use various methods like retail stores, vending machines, direct mail, and the internet. Specialty stores cater to specific markets and offer expertise in those products, while convenience stores sell everyday items nearby with long hours. Department stores are located in shopping centers, offer services, and have various departments for different products. Supermarkets and hypermarkets mainly sell food at competitive prices and encourage self-service.