(computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet
"The IT team installed a new firewall to protect our local network from external hackers."
a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle
"The new code required that every floor in the high-rise be separated by a thick concrete firewall to stop flames from racing between levels."
A fireproof barrier used to prevent the spread of fire between or through buildings, structures, electrical substation transformers, or within an aircraft or vehicle.
"The construction crew installed a reinforced concrete firewall between the two warehouses to ensure that any blaze in one building could not jump over to the other."
In plain English: A firewall is a security system that blocks unwanted access to your computer or network.
"The company installed a new firewall to protect its customer data from hackers."
Usage: In everyday conversation, "firewall" refers to a security system that blocks unauthorized access to computer networks rather than a physical barrier against flames. Use this term when discussing digital protection, not when describing fireproof walls in buildings or vehicles.
To protect with a firewall.
"The IT team installed a new software patch to strengthen the company's firewall against recent cyberattacks."
In plain English: To firewall something means to block it from entering your computer system.
"The IT team decided to firewall that unauthorized access attempt before any data could be stolen."
Usage: Do not use "firewall" as a verb to mean blocking someone from entering or firing an employee; these actions require different terms like "block," "stop," or "terminate." The only correct everyday usage of "firewall" as a verb is strictly in the context of cybersecurity, meaning to protect a computer system from unauthorized access.
The word "firewall" originally referred to a physical barrier made of fire-resistant materials designed to stop the spread of flames in buildings and ships. In computing, it describes a security system that monitors network traffic, while its political meaning comes directly from the German term Brandmauer.