Firewalld is a dynamic firewall management tool for Linux systems that simplifies the process of configuring and managing firewall rules. It uses zones to define the level of trust for network connections, allowing users to easily control access based on the source of the traffic. With a user-friendly command-line interface and graphical front-end options, Firewalld enables administrators to add, remove, or modify rules without needing to restart the firewall. This flexibility makes it suitable for both beginners and experienced users, ensuring that network security can be maintained efficiently.