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  Consumers find a product of interest by visiting the website of the retailer directly or by searching among alternative vendors using a  shopping search engine . Once a particular product has been found on the website of the seller, most online retailers use  shopping cart software  to allow the consumer to accumulate multiple items and to adjust quantities, like filling a physical shopping cart or basket in a conventional store. A "checkout" process follows (continuing the physical-store analogy) in which payment and delivery information is collected, if necessary. Some stores allow consumers to sign up for a permanent online account so that some or all of this information only needs to be entered once. The consumer often receives an e-mail confirmation once the transaction is complete. Less sophisticated stores may rely on consumers to phone or e-mail their orders (although full credit card numbers, expiry date, and  Card Security Code , [26]  or bank account and routing

  One of the earliest forms of trade conducted online was   IBM 's   online transaction processing   (OLTP) developed in the 1960s, which allowed the processing of financial transactions in real-time. [2]   The computerized ticket reservation system developed for   American Airlines   called   Semi-Automatic Business Research Environment   (SABRE) was one of its applications. There, computer terminals located in different travel agencies were linked to a large IBM mainframe computer, which processed transactions simultaneously and coordinated them so that all travel agents had access to the same information at the same time. [2]   At some point between 1971 and 1971, students at Stanford and MIT used the internet precursor   ARPANET   to make a deal to exchange   marijuana , but the interaction doesn't qualify as e-commerce because no money was transferred online. [3] The emergence of online shopping as it is known today developed with the emergence of the Internet. [4]  Initia

  Online shopping   is a form of   electronic commerce   which allows consumers to directly buy   goods   or   services   from a seller over the   Internet   using a   web browser   or a   mobile app . Consumers find a product of interest by visiting the   website   of the retailer directly or by searching among alternative vendors using a   shopping search engine , which displays the same product's availability and pricing at different e-retailers. As of 2020, customers can shop online using a range of different computers and devices, including   desktop computers ,   laptops ,   tablet computers   and   smartphones . An online shop evokes the physical analogy of buying  products  or services at a regular  "bricks-and-mortar"   retailer  or  shopping center ; the process is called business-to-consumer (B2C) online shopping. When an online store is set up to enable businesses to buy from another businesses, the process is called  business-to-business  (B2B) online shoppin