E-commerce involves the buying and selling of goods & services over electronic systems such as the Internet and other computer networks. E-commerce is usually regarded to be the sales element of E-business. It also involves the exchange of data to accomplish the financing and payment factors of the purchases.

There are several e-commerce programs available on the internet which can be set up on a website & potential customers can buy the offered items on the internet. The e-commerce software application must be installed on the server which hosts the site, or on the secure server which takes sensitive ordering information. The software allows online shopping customers to accumulate a product for purchase, described metaphorically as "placing items in the shopping cart". Upon check out, the software typically determines a total for the order, such as shipping and delivery charges and the associated taxation, as applicable.

So, E-commerce is really a part of online Business.