What is HTML?

HTML stands for Hyper Text 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 elements label pieces of content such as "this is a heading", "this is a paragraph", "this is a link", etc.

Example of Simple HTML Document:

<!DOCTYPE html>

<html>

<head>

<title> Title of your page</title>

</head>

<body>

<h1> Heading</h1>

<p> Paragraph</p>

</body>

</html>

<DOCTYPE html> this declaration defines the type of document is HTML 5.
<html> defines the root of the page.
<head> has the meta info about your HTML page.
The title of your page is written between <title>and </title> which is shown on the browser's tab.
<body> element is considered as the document body and has headings, paragraphs, images, links, and many other visible contents.
<h1> tag shows the major size of heading.
<p> shows the paragraph.

An HTML element is defined by some content enclosed in a start tag and an end tag.

<tagname>Content will be here....</tagname>

The HTML element is everything from the beginning tag to it's end tag:

<h1> Heading</h1>

<p> paragraph.</p>

The above-highlighted line will be considered as an element.