An Intrusion Detection System (IDS) is a security tool designed to monitor network traffic and identify suspicious activities or policy violations. It analyzes data packets and alerts administrators about potential threats, helping to protect systems from unauthorized access or attacks. 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. By detecting intrusions early, an IDS plays a crucial role in maintaining the security of information systems and safeguarding sensitive data from cyber threats.