Cover Vs. Concealment

[Uziyahu]

British use these terms differently, I believe.

These are the American definitions:

1) Concealment is that which obstructs the line-of-sight between the shooter and the target.  You can't aim at what you can't see, but...

2) Cover is that which will reliably stop a bullet of a given caliber.  Most pistol rounds and 5.56mm NATO (also known as .223 Remington) will go through plywood, thin sheet metal and plasterboard.   Brick walls under sustained fire.  7.62mm (NATO or Soviet) will go through cinderblock walls and heavier sheet metal fairly reliably.

Bulletproof glass will offer cover from bullets, but not concealment.

A bush or hedge may offer concealment, but not cover.

[Kiwi]

A car will offer Concealment not cover unless armor plated, or you position yourself near the engine block.

[Ultra Requete]

That's correct, it's better to be undetected and concealed than in cover and pinned down by enemy fire and cars are worst cover possible. They stop only pistol civilian issued bullets.