Your larynx is your voice box. It houses your vocal cords. It’s situated in behind the Adam’s apple which is that bump you feel in your throat…you know, the bump in your neck that is usually larger on a guy than a girl.
Good singing technique requires that the larynx remains low and stable. So go ahead and try this. Put your finger on your Adam’s Apple while singing and see if it is rising when you try to sing high notes. In many singers it does go up….way up! The problem is that when your larynx rises too high, it closes off your wind pipe which is, in fact, blocking your vocal cords! This is the last thing you want when singing.
This is what is meant by singing with an open throat. Good technique is having the ability to sing while keeping your larynx in a low and stable position.