What is a Firewall?

Question

Hello
What is a Firewall?
please reply me. i am waiting for your reply.
Thanx

Answer 1

A Firewall is software that blocks unauthorized users from connecting to your computer. All computers at Bank Street are protected by a firewall which is monitored and updated by CIS.

Answer 2

A Firewall is a computer program that monitors the flow of information from the Internet to your computer. There are two different types of firewall available for you to use - Hardware Firewalls and Software Firewalls.

Answer 3

A firewall is a barrier between your computer and the rest of the internet, there to make sure you are as safe as you can be from hackers, worms, viruses and all the other nasty people and programs out there.
In real life, if you look at the roof line of a row of terraced houses you will often see them, sticking up a few bricks above the tiles between each house.
A firewall on a computer does the same job, and if you have a broadband connection to the internet then you need one for your own protection.