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Firewall may refer to:

  • Firewall (construction), a barrier inside a building or vehicle, 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 (computing), a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hosts
    • Personal firewall, often called a "firewall", is a very popular form of firewall designed to protect personal computers
  • Firewall (physics), a hypothetical phenomenon where a freely falling observer spontaneously burns up at the horizon of a black hole[1]

It may also refer to:

See also[edit]


  1. ^ Almheiri, Ahmed; Marolf, Donald; Polchinski, Joseph; Sully, James (11 February 2013). "Black holes: complementarity or firewalls?". Journal of High Energy Physics 2013 (2). arXiv:1207.3123. doi:10.1007/JHEP02(2013)062. "Perhaps the most conservative resolution is that the infalling observer burns up at the horizon."