Glossary

HTML

Definition: HyperText Markup Language is the standard language used to structure content on the web using a system of tags and attributes.

HTML (HyperText Markup Language) is the backbone of every webpage. It provides the semantic structure — headings, paragraphs, links, images, forms — that browsers render into a visual page. HTML is not a programming language; it is a markup language that describes content.

HTML Document Structure

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Page Title</title>
  </head>
  <body>
    <h1>Hello World</h1>
    <p>This is a paragraph.</p>
  </body>
</html>

Key HTML5 Semantic Elements

  • <header>, <nav>, <main>, <article>, <aside>, <footer> — Document regions.
  • <section> — Thematic grouping of content.
  • <figure> / <figcaption> — Images with captions.
  • <time> — Machine-readable dates.

HTML and SEO

  • Use one <h1> per page for the main heading.
  • Add descriptive alt attributes to all images.
  • Structure headings hierarchically: H1 → H2 → H3.
  • Use semantic elements so search engines understand your content.
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