The document discusses channel systems and how they connect sellers with buyers. It notes that few producers sell directly to consumers, instead relying on intermediaries for marketing, distribution, and sales. The rise of the internet has enabled digital interactive services and a digital interactive channel system. It then defines different types of channel systems, including direct selling, selling through intermediaries, dual distribution (using more than one channel simultaneously), and reverse channels (going from consumer to intermediary to beneficiary). The key channel system discussed is dual distribution, which allows manufacturers or wholesalers to both sell directly to consumers and sell to other companies for resale.