The history of the World Wide Web is very recent, so the web standards are changing. Unfortunately, the changes do not happen as fast as might be expected from such a new medium.
Before discussing html 5, it will be useful to clarify the terminology. Give me one minute, and I promise the sentence “html is a language for writing www pages that are transferred using http over the Internet” will make sense if it has not. The middle section will tell you an interesting tidbit or two about the less-known areas of the Internet in as much time, and the last section will finally explain why html 5 is a good thing.