Wholesalers primarily buy from producers and sell to retailers and other businesses, providing essential services in the supply chain despite being considered unglamorous. There are various types of wholesalers, including full-service and limited-service wholesalers, as well as brokers and agents who facilitate transactions without taking title to goods. Retailing involves activities that add value to products for consumer use, including providing product assortments, breaking bulk, holding inventory, and offering services to enhance customer experience.