What is firewall?

user147842

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May 8, 2013
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A firewall is a hardware based network security system that controls the network traffic. Firewall can be implements both in hardware and software. It used to prevent unauthorized Internet users from accessing private networks connected to the Internet.
 

user146660

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May 3, 2013
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A fire wall a part of a computer system or network that is designed to block unauthorized access while permitting outward communication.
 

user128495

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Sep 11, 2012
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Hampton, Maine
Firewall is a software or hardware-based network security system that controls the incoming and outgoing network traffic based on applied rule set. A firewall establishes a barrier between a trusted, secure internal network and another network that is not assumed to be secure and trusted
 

user142229

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Mar 15, 2013
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Firewall is a part of a computer system or network that is designed to block unauthorized access while permitting outward communication.
 

user152488

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Jun 19, 2013
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A firewall is software or hardware that checks information coming from the Internet or a network, and then either blocks it or allows it to pass through to your computer, depending on your firewall settings.

A firewall can help prevent hackers or malicious software (such as worms) from gaining access to your computer through a network or the Internet. A firewall can also help stop your computer from sending malicious software to other computers.

The following illustration shows how a firewall works.

Illustration showing how a firewall creates a barrier between the Internet and your computer
Just as a brick wall can create a physical barrier, a firewall creates a barrier between the Internet and your computer
A firewall isn't the same thing as an antivirus program. To help protect your computer, you need both a firewall and an antivirus and anti-malware program.
 

user152750

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Jun 20, 2013
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Firewall is the security tools which apply on the out side of networks . so that you can restrict the bad website or harmful content.
 

user152809

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Jun 20, 2013
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Firewall is program that used to prevent unauthorized Internet and allows to restrict programs to run on your computer.
 

user144194

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Apr 12, 2013
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Hi everyone,
Actually firewall is hardware security program which is beneficial for control the incoming and out going based traffic according to my self .
Regards:
Sameer shokat .
 

user152875

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Jun 20, 2013
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Hello Everyone,
Firewall is basically a software program or say a piece of hardware that helps protect your system from the internet threats based on the set of rules.
 

user151205

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Jun 13, 2013
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A firewall intercepts all communications between you and the Internet and decides if the information is allowed to pass.
 

user157538

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Aug 2, 2013
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A fire wall a part of a computer system or network that is designed to block unauthorized access while permitting outward communication.