AWS Managed Microsoft AD enables you to use a highly available managed Microsoft Active Directory in the AWS Cloud. Built from actual Microsoft Active Directory (AD), it makes it easy to migrate AD-aware applications while reducing the work of managing AD infrastructure in the AWS Cloud. You can also use your Microsoft AD credentials to connect to Amazon RDS for SQL Server instances and to sign in to AWS applications and services such as Amazon WorkSpaces. AWS Managed Microsoft AD enables you to use your existing AD identities in the AWS cloud, or you can create identities in your AWS managed directory.
AD Connector is a proxy that enables AWS applications such as AWS Single Sign-On to use your existing on-premises AD identities without requiring AD infrastructure in the AWS Cloud. You can also use AD Connector to join Amazon EC2 instances to your on-premises AD domain and manage these instances using your existing group policy objects.