How can you differentiate wholesale trade and retail trade?

Wholesale trade means buying goods in large quantities directly from the producers and selling them to retailers in relatively small quantities. A wholesaler purchases goods in large quantities directly from the producers and sells them in smaller quantities to retailers. Thus, he acts as a link between a manufacturer and a retailer.
Whereas retailer purchase and collects various kinds of goods from numerous sources and sells them to the consumers in small lots. He acts as an important link in the channel of distribution.