The major categories of e-commerce are:
1. Business to Business (B2B) – this involves transactions between two businesses or corporate. The two businesses could be business partners or have any other business relation.
2. Business to Customers (B2C) – this involves transactions between business and end users. This is perhaps the most widely used form of e-commerce in terms of number of users and number of transactions. Amazon is one of the pioneering examples of this type of electronic commerce.
3. Customers to Customers (C2C) – this is concerned with electronic transactions and trade among end-users or person-to-person commerce. E-bay is a fine example of a platform supporting this modality.