An Intrusion Detection System (IDS) is a security tool designed to monitor network traffic and system activities for suspicious behavior or policy violations. It analyzes data packets and logs to identify potential threats, such as unauthorized access or malware attacks. When a potential intrusion is detected, the IDS can alert administrators to take appropriate action. There are two main types of IDS: network-based IDS (NIDS), which monitors network traffic, and host-based IDS (HIDS), which focuses on individual devices. Both types play a crucial role in enhancing the security of systems and networks by providing early detection of potential security breaches.