HTML (HyperText Markup Language),
is the first and dominant markup language for documents on the Web (yes, there
are others, such as XML).
A document in any markup language consists of two components:
Content, such as the text you write and images you include.
Content identifiers (known as "elements" or "tags" in HTML) that classify the content.
HTML is defined by the World Wide Web Consortium (W3), a group of over 500 companies that decide the markup languages and protocols used by the web.