The four levels of e-commerce are:
Business-to-Consumer (B2C) – Transactions between businesses and individual consumers.
Business-to-Business (B2B) – Transactions between businesses.
Consumer-to-Consumer (C2C) – Transactions between individual consumers.
Consumer-to-Business (C2B) – Transactions where individual consumers offer products or services to businesses.
Each level represents a different type of online trading, catering to specific market segments and fulfilling distinct consumer and business needs.