1. Business-to-Consumer (B2C): This is the most common type of e-commerce, where businesses sell goods and services directly to consumers. Examples include Amazon, eBay, and online retailers selling clothing, electronics, and other products.

2. Business-to-Business (B2B): This involves businesses selling products and services to other businesses. Examples include companies selling raw materials, software, or marketing services to other companies.

These are the two main categories, but there are also other types of e-commerce, such as:

* Consumer-to-Consumer (C2C): Individuals sell goods and services to other individuals, such as on platforms like eBay or Craigslist.

* Business-to-Government (B2G): Businesses sell goods and services to government agencies.

* Government-to-Business (G2B): Government agencies sell goods and services to businesses.

* Government-to-Consumer (G2C): Government agencies sell goods and services to consumers.

* Consumer-to-Business (C2B): Individuals sell goods and services to businesses, like freelance writers or photographers.

While the B2C and B2B categories are the most prominent, understanding the other types can give you a better understanding of the diverse world of online transactions.