eCommerce is a subset of business, where products and services are advertised, bought and sold over the Internet. Many businesses have become extremely profitable through online sales. Dell Computers is a prime example. Small companies and even individuals can also market their products or services on a worldwide basis through eCommerce. Large companies can reduce sales and stocking costs by selling online.

If this gets you interested, questions you may have are:

How is eCommerce different than traditional sales?
What are the advantages and disadvantages of eCommerce?
How can a business get set up to sell online?