Often people think that HTML is a programming language; instead, HTML is a markup language. It is helpful in organizing and presenting data on the Web. The latest version of HTML is HTML 5. To execute HTML 5 code, you do not require your own environment.
In 2004, the Web Hypertext Application Technology Working Group (WHATWG) started working on the new standard. By that time, HTML 4.01 was not updated and the W3C was focusing on the future developments. Later on HTML 5 was released with a bunch of features, such as playing audio and video within the Web pages, using Scalable Vector Graphics, and many more.