A firewall is a type of network security system. This means that it will prevent outside sources from getting information from your very own computer or device. Your computer or other devices may hold information that is vital to your identity. It may have details about your current address, your telephone number, your birthday, and so much more.
Hackers will only need to get a few of this information in order to do identity theft. You do not want to become a victim of this as most people are not even traced. Take note that firewalls will also prevent unauthorized access to the network that you are using.