Firewall

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: 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