HTML stands for Hyper Text Markup Language, which is the most widely used language on Web to develop web pages.
HTML was created by Berners-Lee in late 1991. "HTML 2.0, the first standard HTML specification, was published in 1995. HTML 4.01 was published in late 1999. HTML 4.01 version is widely used and there is an HTML-5 version which is an extension to HTML 4.0. This version was published in 2012.
Please familiarize yourself with HTML tags.
<start tag>Text to format</end tag>
Tutorial - less advanced
Tutorial - more advanced