Is pfSense just a firewall?

Is pfSense merely a firewall, or does it offer a broader range of capabilities and functionalities? Could you elaborate on its versatility in managing network security, monitoring traffic, and providing other advanced features that extend beyond basic firewall functionality? I'm curious to understand if pfSense can serve as a comprehensive solution for network administrators looking to secure and optimize their networks, or if it's better suited as a single-purpose tool for specific security tasks.