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An IDS (Intrusion Detection System) is a network security system designed to identify intrusive or malicious behavior via monitoring of network activity. The IDS identifies suspicious patterns that may indicate an attempt to attack, break in to, or otherwise compromise a system. An IDS can be network-based or host-based, passive or reactive, and can rely on either misuse detection or anomaly detection.
IDS vs Firewalls. Firewalls specify policies about what traffic may or may not enter a particular computer network. An IDS monitors patterns of traffic and signals an alert once it deems that an attack has taken place.
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