Commerce conducted over the Internet , most often via the World Wide Web . E-commerce can apply to purchases made through the Web or to business-to-business activities such as inventory transfers. A customer can order items from a vendor's Web site, paying with a credit card (the customer enters account information via the computer) or with a previously established "cybercash" account. The transaction information is transmitted (usually by modem ) to a financial institution for payment clearance and to the vendor for order fulfillment. Personal and account information is kept confidential through the use of "secured transactions" that use encryption technology standing similar to that of paper signatures, allowing contracts and other agreements, such as those establishing a, Live Psychic Chat, loan, brokerage account and even completing a sale on Live Auctions websites can now be signed officially on line.