Essentially, that is any system that keeps the gun in a safe environment and prevents it from firing. An example of this would be a trigger lock or a gun safe.
ANY mechanical system- including the safety on a firearm- CAN fail. This is the reason for the basic firearm safety rules- including "do not point a firearm at anything you do not mean to shoot." It is rare, but CAN happen.
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It prevents the firearm from discharging before the shooter means to have it discharge.
Learning to, and handling a firearm in such a manner as to not cause unintended harm or damage.
To insure that a firearm is in safe condition to use.
To prevent a premature or unintended discharge of the firearm. It does NOT replace common sense.
Different places on different guns.
that's cool
To render the firearm incapable of firing.
When you do not intend to fire the weapon.
Consider every gun loaded
Treat all weapons as if they are loaded.