E-commerce is the activity of buying or selling of on online services products or over the Internet. Modern electronic commerce typically uses the World Wide Web for at least one part transaction’s life cycle although it may also use other technologies such as e-mail. E-commerce is sup by electronic business. E-commerce businesses may also employ some or all of the followings: Online shopping for retail sales direct to consumers via Web sites and mobile and conversational commerce via live chat, chatbots, and voice assistants Providing or participating in online marketplaces, which process third-party business consumer or consumer-to-consumer sales Business-to-business buying and selling Gathering and using demographic data through web contacts and social media Business-to-business (B2B) electronic data interchange Marketing to prospective and established customers by e-mail or fax Engaging in pretail for launching new products and services Online financial exchanges for currency exchanges or trading purposes. Ecommerce, also known as electronic commerce or internet commerce, refers to the buying and selling of goods or services using the internet, and the transfer of money and data to execute transactions. Ecommerce is often used to refer to the sale of physical products online, but also describe any kind of commercial transaction that is facilitated through the internet. Whereas E-business refers to all aspects of operating an online business, ecommerce specifically to the transaction of goods and services.

A computer virus is a malicious piece of executable code that propagates typically by attaching itself to a host document that will generally be an executable file[In the context of talking about viruses, the word “host” means a document or a file. A “host” is typically a digital device capable of communicating with other devices. Even more specifically, in the context of networking protocols, a host is whatever is identified by a network address, like the IP address].