IDS stands for Intrusion Detection System. It is a type of security system that monitors and detects malicious activity on a network or computer system. TAGS and EGOS are two types of IDS. TAGS stands for Targeted Attack Guard System and is designed to detect targeted attacks on a network. EGOS stands for Enterprise Guard Operating System and is designed to detect malicious activity on a large scale. Both systems are used to protect networks from malicious activity.