How is a VPN different from a firewall?
A firewall is a barrier that analyzes data packets from the internet that try to connect to your computer and only allows those that meet a predetermined set of rules to get through.
Using a firewall is a great way to protect your device from threats such as virus attacks and worms. However, a firewall can only protect your device from dangerous incoming traffic. To secure and protect the network traffic leaving your device, you need a VPN. A firewall does offer complementary benefits to a VPN, however, and using the two together provides optimal online security.