element is used in the <HEAD> section on an HTML / XHTML page, if we want to use an external style sheet file to decorate the page code example
Example: Embedded, or internal, styles are used for the whole page. Inside the head element, the style tags surround all of the styles for the page
<!DOCTYPE html>
<html>
<head>
<title>CSS Example</title>
<style>
p {
color: red;
}
a {
color: blue;
}
</style>
...