An Intrusion Detection System (IDS) is a security tool designed to monitor network traffic and system activities for signs of malicious behavior or policy violations. It analyzes data packets and logs to identify potential threats, such as unauthorized access or attacks. When suspicious activity is detected, the IDS can alert administrators, allowing them to respond quickly to mitigate risks. There are two main types of IDS: network-based IDS (NIDS), which monitors traffic across the entire network, and host-based IDS (HIDS), which focuses on individual devices. Both types play a crucial role in enhancing the security posture of organizations by providing real-time insights into potential vulnerabilities and threats.