<p>CSS selectors are used in HTML to apply styles and layout properties to specific elements in a web page.</p>
<p>HTML is the markup language used to define the structure and content of web pages, while CSS is the language used to define the presentation and style of those pages. By using CSS selectors, you can target specific HTML elements and apply styles to them without affecting other elements on the page.</p>
<p>For example, if you want to apply a red font color to all the headings in your page, you can use a CSS selector to target all the <code>&lt;h1&gt;</code> to <code>&lt;h6&gt;</code> elements and apply the style:</p>
<pre><code class="lang-plaintext">cssCopy codeh1, h2, h3, h4, h5, h6 {
  color: red;
}
</code></pre>
<p>CSS selectors allow you to create complex styles and layouts by targeting specific elements, groups of elements, or even based on their relationships with other elements on the page. This provides a powerful and flexible way to style and layout web pages.</p>


CSS selectors are used in HTML to apply styles and layout properties to specific elements in a web page.

HTML is the markup language used to define the structure and content of web pages, while CSS is the language used to define the presentation and style of those pages. By using CSS selectors, you can target specific HTML elements and apply styles to them without affecting other elements on the page.

For example, if you want to apply a red font color to all the headings in your page, you can use a CSS selector to target all the `<h1>` to `<h6>` elements and apply the style:

```plaintext
cssCopy codeh1, h2, h3, h4, h5, h6 {
  color: red;
}
```

CSS selectors allow you to create complex styles and layouts by targeting specific elements, groups of elements, or even based on their relationships with other elements on the page. This provides a powerful and flexible way to style and layout web pages.