Wholesale trade means buying and selling of goods in large quantities. Wholesale buy goods from producers or distributors in order to sell them in small quantities to the shopkeepers (retailers). Wholesaler has specialized dealings in particular items. He purchases in bulk from producer or industrialists and sell them in small quantity to retailers.
Retailing means selling the goods (commodities) in small quantities to ultimate consumers. Retailer is a middleman who purchases goods (commodities) from wholesaler or manufacturer and provides these goods to the consumers near their houses.