INTRODUCTION

What is HTML?

• HTML - Hyper Text Markup Language
• It is the standard markup language used to create web pages.
• A markup language is a set of markup tags
• HTML documents are described by HTML tags
• Each HTML tag describes different document content
• It is used by most websites to create visually engaging webpages, user interfaces for web applications, and user interfaces for many mobile applications
• HTML markup consists of several key components, including those called tags (and their attributes), character-based data types, character references and entity references. 
• HTML tags most commonly come in pairs like <h1> and </h1>, although some represent empty elements and so are unpaired, for example <img>. 
• The first tag in such a pair is the start tag, and the second is the end tag (they are also called opening tags and closing tags).