HTML and HTM are both file extensions used for web documents. The main difference between HTML and HTM is that HTML is the standard and more commonly used file extension, while HTM is an alternative file extension that was used in older versions of Windows.
From a technical standpoint, there is no real difference between HTML and HTM. Both file extensions indicate that the file contains HTML code and can be rendered by web browsers.
In modern web development, it is recommended to use the .html file extension for consistency and to align with web standards. However, if you encounter an existing .htm file, it can still be opened and rendered by any modern web browser without any issues.
Here's a simple code block illustrating the basic structure of an HTML file:
<!DOCTYPE html>
<html>
<head>
<title>My Web Page</title>
</head>
<body>
<h1>Hello, World!</h1>
<p>This is my web page.</p>
</body>
</html>