What is HTML?
HTML stands for HyperText Markup Language.
Evolution of HTML
Since the web was first created, there have been several different versions of HTML, each of them an improvement of the last.
The first HTML version was released in 1991 by Tim Berners-Lee as a way for CERN researches to share documents with each other. It all started here.
HTML 2.0 was out by 1995, 3.2 in 1997, 4 in 1997 and 5, the most current one, in 2014.
If you would like to know more about the history of the web, please visit this link.