html is a Hyper Text Markup Language.
It was designed in the early 90s for research/text interchange.
We put text between those markups, like <p></p> for paragraph or <h1></h1> for title, etc.
There are many tags, each one for specific purpose.
Its like a text file with these tags, and saved with html ending. Example is index.html.
Very simple is, that with html you format your text as you would like to see it, and the browser interprets and shows the text formatted between the markups.
Look in the net for learning html, its very easy, and after a week you are able to write html code for yourself and test it local with your browser.
Give it a try, and good luck :-)
We have done so much, for so long, with so little, we are now qualified to do anything with nothing.Mother Teresa