FirewallD is a dynamic firewall management tool used in Linux systems. It provides a user-friendly interface for managing firewall rules and settings, allowing users to easily configure network traffic control. Unlike traditional firewalls, FirewallD supports zones, which define the trust level of network connections. With FirewallD, users can quickly add or remove rules without restarting the firewall service. It operates in both command-line and graphical user interface modes, making it accessible for both novice and experienced users. This flexibility helps enhance system security while simplifying the management of network access.