Microsoft Defender for Endpoint is a cross-platform security solution for Windows, macOS, Linux, and mobile devices that provides asset discovery, vulnerability management, and threat protection. It inventories endpoints and software, discovers vulnerabilities and misconfigurations, and prioritizes them by risk. The product uses behavioral analysis, cloud intelligence, and configurable rules to block malicious software, exploit attempts, and connections to malicious domains in real time. It records endpoint behaviors to detect threats, automatically analyzes and correlates alerts into incidents, and supports proactive threat hunting with a query language. For response, it offers automated remediation, endpoint isolation, and live response capabilities through a remote shell, while tamper protection and controlled folder access secure the system and its data.