A Host-Based Intrusion Detection System (HIDS) is a security solution that monitors and analyzes the activities on a specific computer or server. It checks for suspicious behavior, unauthorized access, and changes to system files. By focusing on individual hosts, HIDS can detect threats that may bypass network-based systems. HIDS typically uses logs and file integrity checks to identify potential security breaches. It can alert administrators about unusual activities, helping to protect sensitive data and maintain system integrity. This type of system is essential for organizations that require detailed monitoring of their critical assets.