In ecommerce, a channel is any medium through which you sell your products,for example, Shopify, Amazon, Jabong, eBay and Flipkart etc.
A sales channel can be a marketplace, shopping cart or a B2B medium.

Classification of channels

Business to Business (B2B)
A channel which is an ecommerce portal and that buys from Seller and invoices the customer. In this interaction the transactions are happening between businesses, these are classified as B2B channels.

Marketplace
An ecommerce marketplace lists the sellers’ products, collects the orders, receives payments, forwards the orders to the sellers and track the deliveries. And for all this it deducts a fee or earns a commission from the seller.

Shopping Cart
It is the standard ecommerce platform with cart solutions for your own ecommerce website.