The wind blows wherever it pleases. You hear its sound, but you cannot tell where it comes from or where it is going.
CloudTrail is a governance, compliance, risk management, and auditing service that records account activity within an AWS account. Any actions taken by users, roles, or AWS services are recorded to the service. Activity is recorded as a CloudTrail event, and by default you can view 90 days via event history.
CloudWatch is a service that provides near real-time monitoring of AWS products. In essence, it’s a metrics repository. You can import custom metric data in real-time from some AWS services and on-premises platforms.
Systems Manager helps you automatically collect software inventory, apply OS patches, create system images, and configure Windows and Linux operating systems.
CloudFormation is an Infrastructure as Code (IaC) product — you can create manage, and remove infrastructure using JSON or YAML. CloudFormation is effective if you frequently deploy the same infrastructure or you require guaranteed consistent configuration.
OpsWorks is an implementation of the Chef configuration management and deployment platform. OpsWorks moves away from the low-level configurability of CloudFormation but not as far as Elastic Beanstalk. OpsWorks lets you create a stack of resources with layers and manage resources as a unit.