What is the relationship between PHP and HTML in web development?

PHP is a server-side scripting language commonly used in web development to generate dynamic content. It can be embedded within HTML code to create dynamic web pages. By using PHP, developers can easily interact with databases, handle form submissions, and perform other server-side tasks to enhance the functionality of a website.

<!DOCTYPE html>
<html>
<body>

<?php
// PHP code to generate dynamic content
$heading = "Welcome to our website!";
echo "<h1>$heading</h1>";
?>

</body>
</html>