Security appliances are specialized hardware devices designed to protect computer networks and systems from various threats. They can include firewalls, intrusion detection systems, and antivirus gateways, which work together to monitor and control incoming and outgoing network traffic. By analyzing data packets, these appliances help prevent unauthorized access and cyberattacks. These devices often come with built-in software that provides real-time protection and alerts administrators to potential security breaches. Organizations use security appliances to enhance their overall cybersecurity posture, ensuring that sensitive information remains safe from threats like malware and phishing attacks.