Webpages are written in HTML - a simple scripting language. The acronym HTML stands for Hyper Text Markup Language - the primary programming language used to write content on the Web.
Hypertext is simply a piece of text that works as a link.
Markup Language is a way of writing layout information within documents.
Basically an HTML document is a plain text file that contains text and nothing else. It provides a means to describe the structure of text-based information in a document — by denoting certain text as links, headings, paragraphs, lists, and so on — and to supplement that text with interactive forms, embedded images, and other objects.
HTML codes, also referred to as HTML tags, are enclosed by the lesser than (<) and greater than (>) brackets and may be written in capital or lower case letters.
The opening bracket is followed by an element, which is a browser command, and ends with the closing bracket.
An element may also be followed by attributes, which are words describing the properties of the element, and further instruct the browser.