A Zener diode is a basic type of diode which operates in reverse breakdown region. A zener diode has a specific reverse breakdown voltage which prevents current flow until certain value. However after reaching that specific breakdown voltage, the current starts to flow. Due to its property, it can be used as a voltage regulator. Practically a zener diode is used in power supplies, voltmeters and many other electronic instruments.
After watching this video you’ll be able to learn the basic working of Zener Diode.