A computer firewall is a network security software program that monitors unauthorized access going to or coming from a private network based on predetermined security rules. Basically, a firewall is established to stop any intrusion and to provide a solid policy regarding access control. Firewalls are the first line of defense in network security and can be used to enhance the security of computers connected to a network such as LAN or the internet.

Firewalls establish a barrier between a trusted internal network and an untrusted external networks such as the internet. What the firewall does, is that it isolates Your computer from the internet using a “wall of code” which inspects each individual “packets” of data, as it arrives at either side of the firewall, inbound to or outbound from your computer and makes a determination whether it should be allowed to pass or block.

The main goal of a Personal firewall is to protect your personal computer and private network from malicious mischief. A personal firewall is most important and is needed to protect your computer. A firewall works like a filter and can be programmed to allow what you want to get in and what you want to get out and everything thing else is blocked.

Having entered the age of high-speed internet access, when you connect your computer to a broad network you are limiting the control you have over it as well as limited protection. To mitigate against this you must install a personal firewall.

Your firewall should be able to:

• defend resources
• validate access
• manage and control network traffic
• record and report on events
• act as an intermediary

Large and small companies also find it necessary to have firewall installed to protect valuable databases. Large corporations often have very complex firewalls in place to protect their extensive networks and these firewalls are configured in such a way so as to, mitigate against employees sending inappropriate emails or stealing sensitive data.

Firewalls are also installed to prevent employees from accessing social media sites while they are at work. Also important they prevent computers on the outside accessing computers inside the network. Systems are vulnerable whether home or large corporations. If you are connected to the Internet, you are a potential target to an array of cyber threats, such as hackers, key-loggers, and Trojans, and so the need to have a firewall installed in your computers ha have been made clear.

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