firewall (noun)

(colloquial) the application of maximum thrust

"he moved the throttle to the firewall"

firewall (noun)

(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

firewall (noun)

a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle

firewall (Noun)

A fireproof barrier used to prevent the spread of fire between or through buildings, structures, electrical substation transformers, or within an aircraft or vehicle.

firewall (Noun)

The software that monitors traffic in and out of a private network or a personal computer and allows or blocks such traffic depending on its perceived threat.

firewall (Verb)

To protect with a firewall.

firewall (Verb)

To block with a firewall.

firewall (Verb)

To use maximum acceleration.

Firewall

In computing, a firewall is a software or hardware-based network security system that controls the incoming and outgoing network traffic by analyzing the data packets and determining whether they should be allowed through or not, based on a rule set. A network's firewall builds a bridge between the internal network or computer it protects, upon securing that the other network is secure and trusted, usually an external network, such as the Internet, that is not assumed to be secure and trusted. Many personal computer operating systems include software-based firewalls to protect against threats from the public Internet. Many routers that pass data between networks contain firewall components and, conversely, many firewalls can perform basic routing functions.