What is the significance of using $_POST['dom'] instead of $dom in the code?

Using `$_POST['dom']` instead of `$dom` in the code is significant because it ensures that the value being used is specifically coming from a form submission via the POST method. This helps prevent security vulnerabilities such as injection attacks and ensures that the data being processed is coming from a trusted source.

$dom = $_POST['dom']; // Using $_POST['dom'] to securely retrieve form data
// Rest of the code using $dom