Look up firewall in Wiktionary, the free dictionary.
Firewall may refer to:
- Firewall (computing), a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hosts
- Firewall (construction), a barrier inside a building, designed to limit the spread of fire, heat and structural collapse
- Firewall (engine), the part of a vehicle that separates the engine compartment from the rest of the vehicle
- Firewall (physics), a hypothetical phenomenon where a freely falling observer spontaneously burns up at the horizon of a black hole
- Firewall (politics), also known as Cordon sanitaire (politics): the refusal of one or more political parties to cooperate with certain other political parties.
- For example, see Firewall against the far-right in Germany