What are the differences between a cardioid and a supercardioid microphone polar pattern?

The main difference between a cardioid and a supercardioid microphone polar pattern is the directionality of sound they pick up. A cardioid microphone is more sensitive to sound from the front and less sensitive to sound from the sides and rear, while a supercardioid microphone is even more focused on sound from the front and has a narrower pickup angle, making it better at rejecting unwanted noise from the sides and rear.