There are basically 4 types of marketing channels: direct selling; selling through intermediaries; dual distribution; and reverse channels.
Define direct selling, indirect channels, dual distribution, and reverse channels
Direct selling is the marketing and selling of products directly to consumers away from a fixed retail location.
An intermediary (or go-between) is a third party that offers intermediation services between two trading parties.
Dual distribution describes a wide variety of marketing arrangments by which the manufacturer or wholesalers use more than one channel simultaneously to reach the end user.
A reverse channel may go from consumer to intermediary to beneficiary.
A marketing channel is a set of practices or activities necessary to transfer the ownership of goods, and to move goods, from the point of production to the point of consumption and, as such, which consists of all the institutions and all the marketing activities in the marketing process.
An intermediary is a third party that offers an intermediation service between two trading parties.