HTML is Hypertext Markup Language. HTML is used to define the meaning and structure of Web Content.
Hypertext refers as a links that connects web pages to one another, either within a single website or between a websites. Links are the fundamental aspects of the Web.
HTML uses "Markup" to annotate the text, images and other content for display in a Web Browser. HTML markup includes special "elements" such as <head>, <title>, <body>, <header>, <footer>, <article>, <section>, <p>, <div>, <span>, <img>, <aside>, <audio>, <canvas>, <datalist>, <details>, <embed>, <nav>, <search>, <output>, <progress>, <video>, <ol>, <ul>, <li> and many others.
An HTML element is set off from other text in a document by "tags", which consist of the element name surrounded by "<" and ">". The name of an element inside a tag is case-insensitive. That is, it can be written in uppercase, lowercase, or a mixture. For example, the <title> tag can be written as <Title>, <TITLE>, or in any other way. However, the convention and recommended practice is to write tags in lowercase.