AWS Certificate Manager (ACM) Private Certificate Authority (CA) is a managed private CA service that enables you to easily and securely manage the lifecycle of your private certificates. ACM Private CA provides you a highly-available private CA service without the upfront investment and ongoing maintenance costs of operating your own private CA. You can now use ACM’s certificate management capabilities to manage public and private certificates centrally. With ACM Private CA developers can now deploy private certificates for internal resources programmatically using APIs. You get the flexibility to create private certificates for applications that require custom certificate lifetimes or resource names.