HTML: Hypertext Markup Language
History: It was written by Tim Berners Lee in 1993.Before to it GML(Generalised markup language) is there then it was updated to SGML(standard Generalised markup language) then HTML was developed.
GML==>GSML==>HTML
later HTML was developed with many new updates, the current version is HTML5.
\=>It is a structure of the webpage. Everything in HTML is done By Tags.
sample code: