When we heared about firewall, generally a picture comes in our mind i.e A wall with a fire. But in computer field a Firewall means a software which prevents unauthorised access of your data from outside such as Internet OR your office when you are connected with LAN's.
Now the question arises that why a Firewall is needed?, What is its work?
The answer is a Firewall is program which is used to save your personel data and to speed up your internet connections by preventing unauthorised programs from access to intenet.
It also save you from being hacked.Now a days the best known firewall is ZONEALARM firewall.
You can download it from its website www.zonealarm.com
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