There are four types of eCommerce models. They are:
Business to customer (B2C): In this service or product is delivered directly to the customers.
Business to Business (B2B): Here the transaction is between one business to another. The customer is not involved in it.
Consumer to Consumer (C2C): When a customer sells goods or services to another customer.
Consumer to Business (C2B): Here customer sells their products to business or organization.