What makes HTML so different from html 5

Question

Web programming

Answer 1

"HTML5 is the standard that defines HTML. The term represents two different concepts.
1. It is a new version of the language HTML, with new elements, attributes, and behaviors, 
2. a larger set of technologies that allows the building of more diverse and powerful Web sites and applications.
This set is sometimes called HTML5 & friends and often shortened to just HTML5."
ref MDN
https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/HTML5