Tenable Network Security has a unified approach to network security monitoring. The company provides software used to manage security policies and scan for vulnerabilities. Tenable's Unified Security Monitoring suite includes four integrated applications, including its flagship Nessus vulnerability scanner. Other applications assess threats between scans (Passive Vulnerability Scanner), monitor security and compliance (Security Center), and aggregate and analyze event log data (Log Correlation Engine). Tenable's customers come from a variety of industries, including financial services, manufacturing, consumer goods, and health care.