Web 2.0

Web 2.0 is a phase and design philosophy of the web emphasizing interactive services, user-generated content, social participation, and collaboration.

Ajax: A web development approach that updates parts of a page asynchronously without reloading the whole page. It made web applications feel more responsive and interactive.
Wikipedia: A multilingual online encyclopedia that readers can edit collaboratively. It demonstrates large-scale knowledge production by volunteers.
Dot-com bubble: A period of rapid speculation in internet companies that peaked around 2000 and was followed by a market collapse. The crash prompted renewed attention to web businesses that could survive and grow.
User-generated content: Media and other material created and published by users rather than produced solely by professional organizations. It became the defining output of participatory websites.
Web 3.0: A contested label for proposed successors to Web 2.0, including semantic-web and blockchain-based visions. Its competing definitions present different answers to Web 2.0's limitations.
Web API: A software interface that lets applications communicate with a web service. APIs let services combine data and functionality across sites.
YouTube: An online video-sharing platform where users upload, watch, and discuss videos. It made user-produced video a central form of online media.
O'Reilly Media: A media company known for books, conferences, and publications about technology. Its 2004 conference helped popularize the Web 2.0 label.
Crowdsourcing: The practice of obtaining ideas, labor, or contributions from a large group, often online. Web platforms enabled organizations to draw on dispersed contributors.
Semantic Web: An approach to the web that gives data structured meaning so software can interpret and connect it. It emphasizes machine-readable information rather than social participation alone.

Linked from 12 pages