What is a firewall? Why do I need one for my computer?Share & Print
A firewall is a protective barrier that prevents unwanted sources such as viruses, worms, trojans and other malicious code from accessing your computer or network. Firewalls can be either hardware-based or software-based. These two types of solutions can also be used in conjunction with one another.
C&IT highly recommends that you use a firewall. Newer operating systems (such as Windows XP or Windows Vista, and Mac OS X 10.4 and above) have software-based firewalls built-in. To configure these built-in firewalls, click the provided links below.
- Microsoft Windows XP with Service Pack 2 and later: How can I turn on or turn off the firewall in Windows XP Service Pack 2 or later versions?
- Mac OS X: Protecting your computer with a firewall.