A diode is an electrical component acting as a one-way valve for current. And diode is used in very wide range.
Zener diodes are designed to be operated in reverse-bias mode, providing a relatively low, stable breakdown, or zener voltage at which they begin to conduct substantial reverse current.
A Zener Diode is a special kind of diode which permits current to flow in the forward direction as normal, but will also allow it to flow in the reverse direction when the voltage is above a certain value - the breakdown voltage known as the Zener voltage.

A zener diode may function as a voltage regulator by acting as an accessory load, drawing more current from the source if the voltage is too high, and less if it is too low .
kingtronics popular part Zener diode BZV55C, BZX55C, BZX84C, BZX85C, 1N4761A, ZM4728 have very strong offer with Kingtronics own brand “KINGTRONICS”. Brief features for your reference:

FEATURES:
Low zener impedance
Low regulation factor
Glass passivated junction
High temperature soldering guaranteed:
260℃/10S at terminals
Case: Minimelf / SOD80
Packaging: Tape and Reel
MPQ: 2.5Kpcs/reel