The complex and evolving technology infrastructure of Web 2.0 includes server-software, content-syndication, messaging-protocols, standards-based browsers with plugins and extensions, and various client-applications. These differing but complementary approaches provide Web 2.0 with information-storage, creation, and dissemination capabilities that go beyond what the public formerly expected of web-sites.

A Web 2.0 website typically features a number of the following techniques:

• Ajax-based rich Internet application techniques
• Non-Ajax-based rich Internet application techniques
• CSS
• Semantically valid XHTML markup and/or the use of Microformats
• Syndication and aggregation of data in RSS/Atom
• Clean and meaningful URLs
• Extensive use of folksonomies (in the form of tags or tagclouds, for example)
• Weblog publishing
• Mashups
• REST or XML Webservice APIs