Microsoft Security Solutions
Defender brands
Microsoft Defender is a family, not one product. Defender for Cloud is multicloud posture management and workload protection (CSPM and CWP). Defender XDR unifies signals across identities, endpoints, email, and cloud apps. Individual workloads: Defender for Endpoint, Defender for Identity, Defender for Office 365, Defender for Cloud Apps, and Defender for IoT.
Sentinel and SecOps
Microsoft Sentinel is cloud-native SIEM and SOAR: collect logs, detect with analytics rules, automate with playbooks (Logic Apps). Trap: Sentinel is not an endpoint antivirus; Defender for Cloud is not a SIEM.
Secure Score and posture
Microsoft Secure Score measures configuration posture and gives improvement actions. Secure score in Defender for Cloud covers cloud resources. Do not treat score as a compliance certification.
Network and platform controls
Know Azure Firewall, DDoS Protection, Network Security Groups, Azure Bastion, and Key Vault. Microsoft Purview handles data governance and compliance; Defender for Cloud Apps is the CASB for shadow IT and app control.
Traps
- XDR correlates and responds; SIEM aggregates broadly - Sentinel is SIEM/SOAR.
- Defender for Identity monitors on-premises AD signals, not cloud-only tenants.
- CSPM finds misconfigurations; CWP protects workloads (servers, containers).
Rule of thumb
Ask what the tool's primary job is: posture scoring, detection and response, log aggregation, or data governance. Then pick the matching product.
Worked example
"Detect suspicious sign-ins, correlate with endpoint alerts, and auto-run a remediation playbook." Detection plus correlation = Defender XDR; automation playbooks = Sentinel SOAR. A combined answer naming Sentinel with playbooks is correct.