The term eCommerce comes from electronic commerce and defines all commercial transactions conducted on the internet via electronic means. It refers to the buying and selling of products or services and can be B2B (business-to-business), B2C (business-to-consumer), C2C (consumer to consumer) or C2B (consumer to business).

Although the vast majority of websites involved in eCommerce are online stores, websites that offer services and pages that sell non-physical products online can also be listed among those who practice eCommerce (also referred to as e-business).