• HTML stands for a hypertext markup language 
• HTML is the standard markup language for creating Web pages
• HTML describes the structure of a Web page
• HTML consists of a series of elements
• HTML elements tell the browser how to display the content.

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 a pair is the start tag, the second tag is the end tag (they are also called opening tags and closing tags).

<h1> – Start Tag, opening tags

</h1> – End Tag, closing tags

The purpose of a web browser is to read HTML documents and compose them into visible or audible web pages. The browser does not display the HTML tags but uses the tags to interpret the content of the page.

HTML can also include images, audio, and video files in a document.

HTML is Not Case Sensitive

HTML tags are not case sensitive: <P> means the same as <p>.