FWLL meaning in Computing ?

What is Firewall mean?

Firewall may refer to:

Firewall (computing), a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hostsFirewall (construction), a barrier inside a building, designed to limit the spread of fire, heat and structural collapseFirewall (engine), the part of a vehicle that separates the engine compartment from the rest of the vehicleFirewall (physics), a hypothetical phenomenon where a freely falling observer spontaneously burns up at the horizon of a black hole reference