Great question!
The model that an e-commerce business takes depends on the kind of service delivered and the status of the parties at the point of service delivery–Whether they are consumers or business owners.

Hence, four main models can be used in the identification of businesses on the internet and they include the following:
Business-to-Business (B2B)
These are online platforms that sell their services or products to other businesses. They provide high-end products that are acquired by businesses running their operation. Examples of such include Hubspot which provides marketing tools to businesses.

Business-to-Consumer (B2C)
This is the most common e-commerce model out there. Here, a business sells directly to consumers. This can include merchandise such as books, gadgets, fashion items, and even services. This model can range from everyday items like in Amazon or it could be streaming services as with Netflix and Hulu.

Customer-to-Customer (C2C)
This business model covers every company that serves as an intermediary in helping to connect customers to other customers. An example is eBay where people sell to others on the internet.

Customer-to-Business (C2B)
In this model, the consumer produces the value that is used by businesses. This can be in the form of content creation, review, or freelancing.