HTML (HyperText Markup Language) is the standard language used to create and design webpages. It describes the structure of a webpage using a system of elements and tags.
### Types of HTML Tags
1. **Structural Tags**: Define the structure of the document.
- `<html>`: The root element of an HTML document.
- `<head>`: Contains metadata, scripts, and link tags.
- `<body>`: Contains the content of the document.
- `<header>`: Defines a header for a document or section.
- `<footer>`: Defines a footer for a document or section.
- `<section>`: Defines a section in a document.
- `<article>`: Defines an independent, self-contained article.
- `<nav>`: Defines navigation links.
- `<aside>`: Defines content aside from the main content.
- `<div>`: Defines a division or section in a document.
2. **Formatting Tags**: Affect the appearance of the text.
- `<p>`: Defines a paragraph.
- `<h1>` to `<h6>`: Define headings, `<h1>` being the highest level.
- `<b>`: Defines bold text.
- `<i>`: Defines italic text.
- `<u>`: Defines underlined text.
- `<em>`: Defines emphasized text (usually italic).
- `<strong>`: Defines important text (usually bold).
- `<small>`: Defines smaller text.
- `<mark>`: Defines marked/highlighted text.
- `<del>`: Defines deleted text.
- `<ins>`: Defines inserted text.
3. **Link and Media Tags**: Incorporate other resources.
- `<a>`: Defines a hyperlink.
- `<img>`: Embeds an image.
- `<audio>`: Embeds sound content.
- `<video>`: Embeds video content.
- `<source>`: Specifies multiple media resources.
- `<track>`: Defines text tracks for `<video>` and `<audio>`.
4. **List Tags**: Create lists.
- `<ul>`: Defines an unordered list.
- `<ol>`: Defines an ordered list.
- `<li>`: Defines a list item.
- `<dl>`: Defines a description list.
- `<dt>`: Defines a term in a description list.
- `<dd>`: Defines a description of a term in a description list.
5. **Table Tags**: Create tables.
- `<table>`: Defines a table.
- `<tr>`: Defines a table row.
- `<th>`: Defines a table header cell.
- `<td>`: Defines a table data cell.
- `<caption>`: Defines a table caption.
6. **Form Tags**: Create interactive forms.
- `<form>`: Defines a form.
- `<input>`: Defines an input control.
- `<textarea>`: Defines a multi-line text input control.
- `<button>`: Defines a clickable button.
- `<label>`: Defines a label for an input element.
- `<select>`: Defines a drop-down list.
- `<option>`: Defines an option in a drop-down list.
- `<fieldset>`: Groups related elements in a form.
- `<legend>`: Defines a caption for a `<fieldset>`.
These tags, among others, allow developers to create structured and styled webpages that are interactive and accessible.