How can variables be transmitted via URL without being displayed in the URL?

To transmit variables via URL without displaying them in the URL, you can use the POST method instead of the GET method. This way, the variables are sent in the background, making them not visible in the URL. In PHP, you can use a form with method="post" to send the variables to another page without displaying them in the URL.

<form action="target_page.php" method="post">
    <input type="hidden" name="variable_name" value="variable_value">
    <input type="submit" value="Submit">
</form>