The ability for to buy and sell goods via online payment and inventoring through a website.
E-commerce is the buying and selling of good or services via the internet, and the transfer of money and data to complete the sales. It’s also known as electronic commerce or internet commerce. The Future of E-Commerce
E-commerce, in full electronic commerce, maintaining relationships and conducting business transactions that include selling information, services, and goods by means of computer telecommunications networks. Britannica
E-commerce (electronic commerce) is the activity of electronically buying or selling of products on online services or over the Internet. Wikipedia