Intranet Domain Name Service (IDNS) provides highly available and scalable DNS resolution services along with domain name management. It converts domain names or application resources into IP addresses required for network connection, routing visitors to desired resources. This ensures access to application resources and connections to intranet services. Intranet DNS offers secure, comprehensive, and high-performance domain name resolution within a VPC. It can directly respond to requests for intranet domain resolution and effectively prevent hijacking, mitigating security risks.