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An Intrusion Detection System (IDS) is a tool specifically designed for real-time monitoring of network traffic. It analyzes data packets traveling through the network to identify suspicious activities, unauthorized access attempts, or potential security breaches. By continuously monitoring network traffic, an IDS helps security teams detect threats as they occur, allowing for a prompt response to potential incidents.

Unlike a firewall, which primarily controls incoming and outgoing traffic based on predetermined security rules, an IDS focuses on analyzing traffic patterns and identifying anomalies. Antivirus software is mainly used to detect and mitigate malware on endpoints and does not provide the real-time network monitoring capabilities that an IDS offers. Encryption software is utilized to secure data in transit or at rest, not to monitor traffic. Therefore, the IDS stands out as the optimal choice for real-time network traffic monitoring.