Assuming that you connect your computer to the Internet, you must use a firewall to protect your computer from unauthorized access. A firewall examines the data coming into and going out of your computer, and then determines if it should allow this data to access your computer, based on a set of rules set up in the firewall. You can use either a hardware firewall or a software firewall. Software firewalls that are installed on a single computer are also referred to as "personal firewalls."
Either solution will monitor the web sites and applications that try to access your computer and prevent them from stealing personal data or hijacking your computer. Hardware firewalls are generally more difficult to set up and generally cost more. As a result, it is recommended that traders install a personal firewall like Norton Internet Security. A firewall is another form of insurance for your computer that will add to its reliability and performance.