Intrusion Detection is a research area in cybersecurity that focuses on identifying and preventing unauthorized access or malicious activities within a computer network or system. Intrusion detection systems (IDS) are used to monitor and analyze network traffic or system behavior in order to detect and respond to potential security threats or attacks. These systems can be categorized as either host-based or network-based, and they use a variety of techniques such as signature-based detection, anomaly detection, and behavioral analysis to identify and mitigate security incidents. Intrusion detection is a critical component of overall cybersecurity strategy, helping to protect sensitive data and systems from unauthorized access or manipulation.