Firewall

[Cami]

A physical firewall is a wall made of brick, steel, or other inflammable material that prevents the spread of a fire in a building. In computing, a firewall serves a similar purpose. It acts as a barrier between a trusted system or network and outside connections, such as the Internet. However, a computer firewall is more of a filter than a wall, allowing trusted data to flow through it.
A firewall can be created using either hardware or software. Many businesses and organizations protect their internal networks using hardware firewalls. A single or double firewall may be used to create a demilitarized zone (DMZ), which prevents untrusted data from ever reaching the LAN. Software firewalls are more common for individual users and can be custom configured via a software interface. Both Windows and OS X include built-in firewalls, but more advanced firewall utilities can be installed with Internet security software.
Firewalls can be configured in several different ways. For example, a basic firewall may allow traffic from all IP addresses except those flagged in a blacklist. A more secure firewall might only allow traffic from systems or IP addresses listed in a whitelist. Most firewalls use a combination of rules to filter traffic, such as blocking known threats while allowing incoming traffic from trusted sources. A firewall can also restrict outgoing traffic to prevent spam or hacking attempts.
Network administrators often custom configure hardware and software firewalls. While custom settings may be important for a company network, software firewalls designed for consumers typically include basic default settings that are sufficient for most users. For example, in OS X, simply setting the firewall to On in the Security

[Luis Fok]

A program that defends your computer from [malicious] users accessing and using your computer either as a [port] to someone elses computer or to totally [mess up] yours

[Michiko]

A [geeks] condom; Helps [prevent] [viruses]

[Hina Muqadas]

Any of a number of security [schemes] that prevent unauthorized users from gaining access to a computer network or that [monitor] transfers of information to and from [the network].

[Kit]

When a man with [red hair] [spreads] his [excess] scrotum skin over the face of a woman.

[Marquetta]

1. STD-infected [female] [genitals].

[Merna]

Section of [aircraft] especially designed to allow all [engine] heat and smoke to fill [the cockpit].

[Cami]

A wall or partition designed to inhibit or prevent the spread of fire.

[Tina]

a device or program that stops people from seeing or using information on a computer without permission while it is connected to the internet

[Jessica]

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

[Tariq Zaki]

To protect with a firewall.

[GrokLuth 0]

(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

[Magaret]

To block with a firewall.

[Gornwexy 0]

To use maximum acceleration.

[Quadirdith 0]

(colloquial) the application of maximum thrust

[Sommer]

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.

[Vihan Dobiriyal]

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It serves as a barrier between a trusted internal network and untrusted external networks, such as the Internet, and blocks unauthorized access while permitting authorized communications. Firewalls can be implemented as software, hardware, or a combination of both.

[Welington Mina]

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 networks 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.