Interoperability
Interoperability (of the web and the internet) = the ability to use and combine many different form of media, using a single platform
Explanation
Lawrence Lessig: "Perhaps the most important thing that the Internet has given us is a platform upon which experience is interoperable. At first, the aim of the computer and network geniuses was simply to find a way to make computers talk to each other. Then application geniuses found ways to make the content that runs on these different devices interoperate on a single digital platform. We are close to a world where any format of sound can be mixed with any format of video, and then supplemented with any format of text or images. There are exceptions; there are some who don't play in this interoperability game. But the push of the network has been to produce a world where anyone can clip and combine just about anything to make something new. Just as the senses process many different kinds of experiences (sound, images, smell, emotions) and then offer them for translation on a single platform (the brain), so too have digital networks made it possible to combine many forms of media, and make them usable on single platform." (http://creativecommons.org/weblog/entry/5676)
More Information
See also Open Standards