The software application PC Tools Firewall Plus is a free personal firewall for Microsoft Windows Operating System based computer systems. This protects computer systems by preventing the unauthorized access of Internet or network based malicious codes or users. It works by monitoring applications that use network or Internet connection and has the ability to stop Trojans, keyloggers, backdoors and various malware that can cause havoc to your system or steal private information.

This software is specifically designed for people and not just for computer system experts. It is a powerful tool to prevent against attacks and common exploits are turned on by default while allowing more advanced users to create their own customized packet filtering rules and network defenses.