What are the benefits of using buttons instead of links in PHP forms?

Using buttons instead of links in PHP forms can prevent accidental form submissions when users press the Enter key while focusing on a link. Buttons also provide a more intuitive user interface for submitting forms.

<form method="post" action="submit_form.php">
   <input type="text" name="username" placeholder="Enter your username">
   <button type="submit">Submit</button>
</form>