Hey… Here today I came up with an article on Firewalls. I will speak about how it works and how are they useful for cyber security purpose. Well if you are a regular internet user then you might have heard of the word ‘firewall’ long time before. Well, I will explain it to you with a simple example, when an employee in his office tries to access a website such as social network they get a message “Firewall used” on their screen! This is what the function of a firewall. A firewall protects the entire corporate network so that hackers cannot enter into your private (corporate) network.