The term "Electronic commerce" (or e-Commerce) refers to the use of an electronic medium to carry out commercial transactions. Most of the time, it refers to the sale of products via Internet, but the term eCommerce also covers purchasing mechanisms via Internet (for B-To-B).
A client who purchases on the Internet is called a cyberconsumer. E-Commerce is not only limited to online sales, but also covers:
Preparation of estimates online
Consulting of users
Provision of an electronic catalog
Access plan to point of sales
Real-time management of product availability (stock)
Online payment
Delivery tracking
Full integration with the payment gateway of your choice