Cisco Firewalls are security devices designed to protect networks from unauthorized access and cyber threats. They monitor incoming and outgoing traffic based on predetermined security rules, helping to prevent attacks and data breaches. Cisco offers various firewall solutions, including hardware and software options, suitable for different network sizes and needs. These firewalls can integrate with other Cisco security products, providing a comprehensive defense strategy. Features often include intrusion prevention, VPN support, and advanced threat detection. By implementing Cisco Firewalls, organizations can enhance their overall security posture and ensure safer communication across their networks.