Markup
Websites are built using HTML; CSS is used to define the way a web page should be resented, and JavaScript is used to define how it should function or behave. It
transforms plain text into a Markup document, describing the structure and meaning of the ontent. It tells the computer that special code must be displayed instead of normal text, in the particular way indicated by the Markup language.
HTML text has opening and closing tags – < and > and the text to be displayed on screen is placed between these tags.
To format text for displaying it on any screen, you have to separate the text and the instructions for that particular text. The markup is basically the instructions for how you want the text printed or displayed. Elements within an HTML file are marked up with tags to describe the purpose of that specific content.
You can consider markup language as something that annotes text, allowing computers to manipulate it. Markup languages are readable by humans as it is written so that it is seen as distinct from the text.
HTML5 is the latest version of HTML. Other markup languages are also used, like XML and XHTML; however, HTML is the most popular and widely used.