Getting Started with AWS CloudTrail

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AWS CloudTrail is a service that enables governance, compliance, operational auditing and risk auditing of your AWS account. With CloudTrail, you can log, continuously monitor and retain account activity related to actions across your AWS infrastructure. This includes actions taken within AWS Management Console, AWS SDKs, command line tools and other AWS services. 

CloudTrail creates a trail that captures API calls made using the AWS web service APIs in your AWS account. The captured information includes the identity of the API caller, the time of the API call, the source IP address of the API caller, the request parameters and response elements returned by the AWS service. CloudTrail delivers logs of these API calls to Amazon S3 buckets or CloudWatch Logs that you specify. You can access and analyze these log files using Amazon S3 tools or CloudWatch Logs tools.

Some key benefits of using AWS CloudTrail include:

- Gain visibility into API calls and related events on resources in your AWS account. CloudTrail logs AWS API calls including source IP address from which the calls are made.

- Check who has accessed your resources and when they accessed. The historical information provided by CloudTrail can help in detecting and investigating potential security or compliance issues. 

- Enable continuous monitoring of your AWS resources. You can write rules to automatically respond to changes made using API calls. For example, trigger an alarm if certain actions were taken on some critical resources. 

- Assist in incident investigation and compliance efforts. Audit trails provided by CloudTrail can help in forensic analysis during security investigations or auditing for compliances like PCI, HIPAA etc. 

- Centralized monitoring across all AWS accounts and regions. CloudTrail provides a single place to gain visibility into activities across multiple AWS accounts, services and regions in your AWS infrastructure.

That covers a brief introduction to AWS CloudTrail, its key capabilities and benefits.

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