HTML
Hypertext Markup Language
Markup
"The markup … can be interpreted by a device … to control how a document should look when printed or displayed on a monitor. A marked-up document thus contains two types of text: text to be displayed and markup language on how to display it."
Examples
HTML
Hypertext Markup Language
Page Structure
<!DOCTYPE html>
<html lang="en">
<head>
Document
</head>
<body>
<!-- Visible content goes here -->
</body>
</html>
HTML attributes
<!--
img — The image tag is used to create an image.
src — The attribute to tell the img tag where to find the resource.
https://via.placeholder.com/150x150 — The value of the resource.
alt — The attribute for alternative text.
-->