{"id":30686,"date":"2013-10-30T06:30:50","date_gmt":"2013-10-30T13:30:50","guid":{"rendered":"http:\/\/blogs.mcafee.com\/?p=30686"},"modified":"2025-08-27T22:50:26","modified_gmt":"2025-08-28T05:50:26","slug":"what-is-a-firewall","status":"publish","type":"post","link":"https:\/\/www.mcafee.com\/blogs\/internet-security\/what-is-a-firewall\/","title":{"rendered":"What is a Firewall?"},"content":{"rendered":"

Most of us may have heard the term, and know it’s related to security in some way, but do you really know what a firewall is? Traditionally, firewalls were built to keep danger at bay\u2014they were doors (or walls) to block fire from coming into another area\u2014hence the name firewall. When you’re thinking in terms of your online security, modern-day hardware and software firewalls are similar. They act as barriers to prevent unauthorized access to your personal information.<\/p>\n

Firewalls are software programs or hardware devices that filter the information coming through your Internet connection to your computer (and all the devices that are connected to that connection). A firewall protects you and your devices by examining each piece of information that flows between your devices and the Internet.<\/p>\n

Hardware firewalls, such as those included with some routers, are usually a good first line of defense against outside attacks, and they require little to no configuration. The one down sides of using only a hardware firewall is that it only protects you if you are at home. So if you take your computer to a cafe or on a trip, your device is no longer protected by the home-based firewall.<\/p>\n

Fortunately, software firewalls can catch these kinds of threats because they are running on your computer and can take a closer look at the network traffic. This allows them to intercept a malicious program before it leaves your computer.<\/p>\n

Now that you know the purpose of firewalls, follow these tips for greater security online:<\/p>\n