What is the primary function of an intrusion detection system (IDS)?

The primary function of an intrusion detection system (IDS) is to detect and alert on suspicious activity within a network or system. IDS is designed to monitor network traffic or system activities for any signs of security breaches or policy violations. When the system identifies such anomalies, it generates alerts to inform administrators about potential threats, allowing for timely investigation and response.

While prevention, data recovery, and encryption are crucial elements of overall information security, they are not the core purpose of an IDS. An IDS focuses on detection rather than preemptively stopping threats or securing data, which distinguishes it from tools like firewalls or encryption software that aim to block unauthorized access or protect sensitive information. Therefore, the emphasis on detecting and alerting showcases the critical role an IDS plays in maintaining a secure environment by providing visibility into potential security issues.