What is the difference between an ordinary p-n junction diode and a Zener diode?

Define the term dynamic resistance of a p-n junction diode.

What happens during regulation action of a Zener diode?

Zener diodes have the higher dopant densities as compared to ordinary p-n junction diodes. How does it affect the junction field?

Zener diodes have the higher dopant densities as compared to ordinary p-n junction diodes. How does it affect the width of the depletion layer?