Intrusion Detection Systems (IDS) are security solutions designed to monitor network traffic or system activities for signs of malicious exploits or security breaches. Deployed as either software or hardware, IDS serve as sentinels, alerting administrators when pre-defined patterns, indicative of a security threat, are identified. IDS can be categorized into two main types: Network-based IDS (NIDS) analyze incoming network traffic to identify suspicious patterns, while Host-based IDS (HIDS) focus on system files and system calls on individual devices to detect unauthorized activities. While an IDS doesn't usually take action beyond alerting or logging the suspicious activity, it often works in conjunction with other systems like firewalls or intrusion prevention systems to block potential threats. Given the ever-evolving landscape of cybersecurity threats, IDS are a crucial component of a comprehensive security posture for organizations of all sizes.