What are Vortex Generators and What purpose do they serve?

There is a lot of information over the internet about the purpose of Vortex Generators. I will shed light on just some important notes you should keep in mind as an Aircraft Mechanic, I will try to explain more details later (if necessary) bu updating this post

Before proceeding I assume you are accustomed with the following terms:
Boundary Layer, Laminar/Turbulent Flow, Stall

VORTEX GENERATORS

Vortex Generators are small aerodynamic devices, generally fitted to the leading edge of wings (including ailerons, elevators etc).

The laminar flow tends to separate from the wing at some point (Transition Point) behind the leading edge, as the angle of attack increases the transition point moves forward, this can lead to a situation which will ultimately cause the wing to stall.

Transition Point - The point at which Laminar Flow leaves the airfoil causing a Turbulent Flow in result, so there is a transition from Laminar to Turbulent Flow at the Transition Point


HOW DO THEY WORK
The boundary layer of Laminar Flow is low in energy as compared to that of Turbulent Flow, thus to energize the boundary layer vortex generators are used.

Simple Operational Principle: As the name implies, when the airflow passes over the vortex generators they generate small vortices, these turbulent vortices energize the boundary layer and helps it stick with the airfoil surface thus delaying the formation of transition point/region.

Saw this interesting photo on a website www.aerospaceweb.org which can help you understand the phenomenon

Note: I tried to keep it short and simple. More information can be provided upon your request. Kindly suggest me updates for this article to make it better!