<HTML> ... </HTML>
If you already have looked into some source codes before, you surely will have noticed, that there is always a <HTML> at the beginning and a </HTML> at the end.
If you have got a file only filled with text data,the browser would not be able interpret the tags. Because of this, there is the order <HTML>, which tells the browser: Now everything is HTML code (up to the </html>), and it ought to be interpreted like that.
One also describes this tag as the root element of a HTML-file.
Well, that's a good basis, because now we are getting more and more possibilities. Go to » HEAD / BODY