The Cardioid Microphone

Cardioid means “heart-shaped”, which usually picks up sound from the front, and to a lesser degree at the sides as well. It is used to emphasize sound from the direction the mic is pointed while some are left for movement of the mic and ambient noise.
See my article and video on how the cardioid pattern can help you improve your audio – Improve The Quality Of The Audio You Record At Home – Tip 2
In this article by Audio Undone, we will learn the directional pickup characteristics of an ideal cardioid microphone http://audioundone.com/the-microphone-cardioid-polar-pattern