Selling involves determining customer needs, responding through communication to influence purchase decisions and enhance future business opportunities. The document describes various types of selling classifications including McMurry & Arnod's which categorizes selling positions based on negotiation skills into mainly delivery, inside order taker, outside order taker, missionary selling, technical selling and creative selling. It also discusses Derch Newton classification of trade selling, missionary selling and technical selling as well as consumer indirect selling, industrial selling, group selling, telesales, franchise selling and international selling. Concept selling is described as raising awareness of product benefits to understand customer operations that can be improved.