What is Ecommerce? The most basic eCommerce definition is any kind of business transaction that is online. The most famous example of eCommerce is online shopping. Which is defined as buying and selling of products through the internet on any device. However, eCommerce can also lead to other types of activities, such as online auctions, online ticketing, and internet banking. eCommerce in Canada and world wide is the fastest-growing retail market projected to hit $4.145 trillion worth sales th ...