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Intrusion Detection refers to the process of identifying and responding to malicious activities targeted towards electronic systems, computers, or virtual machines (VMs). It involves monitoring network traffic, system logs, and other relevant data sources to detect signs of intrusions, unauthorized access, or policy violations. The primary goal is to ensure the integrity, confidentiality, and availability of critical information assets by proactively identifying and mitigating potential threats. Intrusion Detection Systems (IDS) are designed to perform this task automatically, using various techniques such as signature-based detection, anomaly-based detection, or hybrid approaches that combine both methods. These systems can be deployed at different layers of the network infrastructure, including the perimeter, internal networks, and individual hosts, providing a comprehensive defense against cyber threats. Overall, Intrusion Detection plays a critical role in maintaining the security posture of modern electronic and computing environments by detecting and responding to advanced persistent threats (APTs), zero-day exploits, and other sophisticated attacks that can compromise system availability, data confidentiality, or regulatory compliance.