Can you explain what the term UFW means and how it works?

UFW (Uncomplicated Firewall) is a simple and user-friendly tool for configuring the firewall in Linux-based systems, especially Ubuntu.

It serves as an interface for managing iptables — the core mechanism for network traffic filtering in the Linux kernel.

How UFW works:

• Allows easy creation of rules to permit or block incoming and outgoing traffic.
• Uses understandable command syntax, for example:

sudo ufw allow 22/tcp   # allow SSH
sudo ufw deny 80/tcp    # block HTTP
sudo ufw enable         # enable firewall
sudo ufw status         # show current rules

• Automatically applies rules on system startup.

UFW simplifies server security configuration without the need to work directly with iptables, reducing the likelihood of errors and speeding up the setup process.