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A number of technologies and applications support e-commerce activities: electronic payment systems, Web marketing, mobile marketing, and search engine optimization.
An electronic payment is a transaction in which money or scrip is exchanged, only electronically.
This usually involves the use of the Internet, other computer networks, and digitally stored value systems.

Payment cards—credit cards, debit cards, charge cards, and smart cards—are the most popular instruments for electronic payment transactions.
A smart card is about the size of a credit card and contains an embedded microprocessor chip for storing important financial and personal information. The chip can be loaded with information and updated periodically.

E-cash, a secure and convenient alternative to bills and coins, complements credit, debit, and charge cards and adds convenience and control to everyday cash transactions.
E-cash usually works with a smart card, and the amount of cash stored on the chip can be “recharged” electronically. You are probably familiar with PayPal, a popular online payment system used on many online auction sites.
Users with valid e-mail addresses can set up PayPal accounts and make secure payments for online transactions using their credit cards or bank accounts.

Web marketing uses the Web and its supporting technologies to promote goods and services. Although traditional media, such as radio and TV, are still used for marketing, the Web offers many unique capabilities, such as message boards for customers to post questions and newsgroups for sending information to customers. Intelligent agents and push technology are also used as Web-marketing tools.
Intelligent agents are an artificial intelligence application that can be used for Web marketing.

According to a recent survey, approximately 60 percent of Internet access is through mobile devices, such as smartphones and tablets. Online businesses should have a mobile marketing strategy in order to stay competitive. Search engine optimization (SEO) is a method for improving the volume or quality of traffic to a website.
It helps a website receive a high ranking in the search results, which tends to generate more revenue for the website.