Systems Manager
Systems Manager is an AWS service that you can use to view and control your infrastructure on AWS.
Using the Systems Manager console, you can view operational data from multiple AWS services and automate operational tasks across your AWS resources.
Systems Manager helps you maintain security and compliance by scanning your managed instances and reporting on (or taking action on) any policy violations it detects.
Managed Instance
A managed instance is a machine that has been configured for use with Systems Manager.
Systems Manager also helps you configure and maintain your managed instances.
Supported machine types include EC2 instances, on-premises servers and VMs (including VMs in other cloud environments).
SSM Agent
Systems Manager Agent (SSM Agent) is Amazon software that can be installed and configured on an EC2 instance, an on-premises server, or a VM.
SSM Agent makes it possible for Systems Manager to update, manage, and configure these resources.
SSM Agent must be installed on each instance you want to use with Systems Manager.
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