The Shield Firewall A firewall is a type of software that monitors all incoming network traffic while you're online and allows in only the connections that are known and trusted. Without a firewall, your computer is ... Cost: $19 Buy full version       Trial version       Publisher: PCSecurityShield     Descriptions The Shield Firewall: A firewall is a type of software that monitors all incoming network traffic while you're online and allows in only the connections that are known and trusted. Without a firewall, your computer is basically an "open door" to hackers. All of your private information such as passwords, credit card numbers you've used for online purchases and documents that you don't want to share with anyone are all available for hackers to steal. Whether you have a dial-up, broadband or DSL connection, every minute that your computer is connected to the Internet, it is at risk. Many people mistakenly think that the anti-virus software that came with their PC protects them completely from hackers. But anti-virus software does nothing to secure your computer against direct hacker attacks.