Is a firewall a SIEM?

I understand that both firewalls and SIEM (Security Information and Event Management) systems play important roles in cybersecurity, but I'm curious if they are interchangeable or if they serve distinct purposes. Could you please clarify whether a firewall is a SIEM, or if they are separate entities with different functions in protecting networks and data? I'm interested in understanding how these tools work together, if at all, to enhance overall security.