What is the difference between $_GET and $_POST

This is a great question because an interviewer can tell how deeply you understand HTTP and the request/response. If you don't have good understanding of HTTP protocol, google around and get a grasp on it. 
Good answer 
Explain the HTTP protocol and how every request contains a method, generally(GET,POST,PUT,DELETE) and what each method signifies. 
Bad answer 
$_GET stores variables passed in url as query strings. $_POST stores variables past from using method = $_POST


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