![]() If an attacker is able to make connections to any one of your applications, he or she could potentially compromise your computer if there exists a security vulnerability in the application. Without firewalls, any applications you have running on your computer that accepts network connections could be connected to by anyone on the Internet. This is why they are so crucial to safe web surfing. ![]() Why do I need one?įirewalls generally do not allow connections inside the network that are initiated from outside the network unless you give them permission. ![]() However, if it sees that you are trying to initiate a connection to a website, it will forward that data along to the router where it will eventually reach the targeted website. For example, if the firewall sees a stream of data in which a random computer on the Internet is trying to connect to a computer inside of your network, it will discard the data and may also warn you about the attempted connection. Firewalls analyze the data, and then throw it out if it looks malicious or forward it to the network if it looks benign. ![]() When data is sent over the Internet, it comes packaged with information about where it is coming from and where it is supposed to go, as well as an indication as to what application the data is for. Firewalls are hardware and/or software systems which protect end users from malicious traffic on the Internet. ![]()
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