Our way of bringing products or services to the market so that it can be purchased by consumers is done through the following channels:

A direct sales channel if it involves a business selling directly to its customers (web shop / website), or it can be indirect if an intermediary such as a retailer or dealer is involved in selling the product to customers.

There is little difference between a sales channel and a distribution channel, except for the fact that distribution channel has more to do with physically getting products across to consumers whereas sales channel is involved mainly in helping to increase sales. The type of sales channel also defines the type of marketing to be done. If the sales channel is direct, then the type of marketing to be done is Business-to-Consumer or B2C marketing.

If the sales channel depends on an intermediary then a Business-to-Business marketing B2B is involved. However, if intermediaries play a major role, but final customer are individual people, then a combination of B2B and B2C marketing is involved.

Source: salesbenchmarkindex
The picture above depicts a typical hierarchy of direct sales channel with respect to value added and cost involved. As we can see, more personalized the channel, higher the cost involved.