ecommerce, e-commerce, or electronic commerce is the conduct of a financial transactions by electronic means.  With the huge success of commerce on the Internet, ecommerce usually refers to shopping at online stores on the World Wide Web, also known as ecommerce Web sites. Ecommerce can be business to business (B to B) or business to consumer (B to C).
e-Commerce, (EC), or eCommerce, is a shortened IT term for Electric Commerce. E-Commerce is the conducting of business communication and transactions over computer networks and through individual computers linked to the Word Wide Web. Strictly defined, eCommerce is the buying and selling of goods and services, and the transfer of funds, through digital communications.

It is also true to say, however, that eCommerce also includes all inter-company and intra-company functions (such as sales, marketing, accounts, logistics, manufacturing, and negotiation) that enable commerce and use electronic mail, EDI (Electronic Data Interchange), file transfer, digital fax, video conferencing, workflow, or interaction with a remote computer.

e-Commerce also includes buying and selling over the World-Wide Web and the Internet, electronic funds transfer, smart cards, digital cash, and all other methods of completing business transactions over digital networks.