A firewall is another method of computer security that puts a safe barrier between your system and Internet network connections.

It is a protective barrier that blocks certain connections to bad activity which can put your computer at risk.  Computer firewalls block hackers from infiltrating your system and hide your computer from unsolicited network traffic.

A computer firewall is NOT to be used as a replacement for anti virus software or Malware removers, but is actually used in conjunction with those.

The Windows operating systems, like XP and Vista do come with firewalls as part of their system, but they are not customizable and do not allow users to specify certain network connection restrictions and which sites to block. For added protection, computer security and the ability to customize connections to your computer here are 3 great free firewalls.

3 Best Free Computer Firewalls

1. PC TOOLS FIREWALL

PC Tools Firewall Plus is a very powerful and efficient personal firewall for Windows that protects your computer from intruders and effectively controls any and all network traffic in and out of your computer system.

Features:

• Smart automatic protection
• User-friendly
• Designed for both, novice & expert users
• Advanced rules to protect your PC against common attacks
• User defined settings options

Safely download the PC Tools Firewall

2. COMODO FIREWALL

Features:

• Detects and prevents intrusions
• Blocks Access Attempts to Your Computer
• Identity Theft Protection against hackers, scripts and Malware
• Blocks installation of Malware/Viruses and Spyware
• Full user customization to block and approve sites
• Malware scan checks for infections prior to install of the firewall

Safely download Comodo Firewall from their official website

3. ZONE ALARM FIREWALL

Features:

• Detects and prevents intrusions
• Detects and prevents hacking
• Blocks Access Attempts
• Online Invisibility
• Light on System Resources

Safely download the free ZoneAlarm Firewall