Importance of $_POST in php | Learning Curve- Perfect Tutorial for the beginers

see the below example

<?php

print_r($_POST);

<html>

<head>

<title>Simple Contact Form</title>

</head>

<body>

Employee Name : <input type="text" name="name" value="" /> <br />

Email : <input type="text" name="email" value="" /> <br />

Phone : <input type="text" name="phone" value="" /> <br />

</form>

</body>

</html>

//ouptut :Array ( [name] => [email] => [phone] => [submit] => Submit )