There are three types of gun safety: physical, mechanical, and trigger.
The trigger safety is a type of mechanical safety that is usually integrated into the trigger of a firearm. For the gun to fire, the trigger must be fully depressed; otherwise, the firing pin will not make contact with the ammunition. This type of safety prevents accidental discharge if the gun is dropped or if something falls on the trigger.
Trigger safeties are found on many different types of firearms, including handguns, rifles, and shotguns. They are particularly common on handguns since they are small and easy to carry, which means there is an increased risk of them being dropped or coming into contact with other objects.
While trigger safeties are an important safety feature, they are not foolproof. It is still possible for a gun to discharge if the trigger is partially depressed or if the gun is tampered with. That is why it is important to always follow the basic rules of gun safety: always keep the gun pointed in a safe direction, keep your finger off the trigger until you are ready to shoot, and always be sure of your target and what is beyond it.
If you have any further questions about trigger safeties or other types of gun safety, please contact a certified firearms instructor.
You can take a look at the principle of operation using the Glock as an example: