HTML or Hypertext Markup Language is the language used to format web
pages. It is comprised of a set of "tags" that identify the size,
colour, font and position of data on a page. It is used to define
the page layout, the positioning of graphics. HTML also allows
hyperlinks to be added on words and images. This feature was
instrumental in the growth of Internet usage, as it allowed Internet
uses to easily navigate from page to page and from site to site without
having to remember obscure internet addresses.
Although HTML is not a programming language itself (i.e "if this, do
that"), it is possible to embed various languages (JavaScript, VBScript)
into HTML.