A firewall is a security tool that limits access between networks and/or systems. A personal firewall controls traffic going to and from your mobile device. You can set the security policy. You can install a personal firewall on the operating system of a mobile device. A conventional firewall is typically installed on the router or other interface between two or more networks. Read more about firewalls.
What is a firewall?
Content last reviewed on May 14, 2019