What is the main benefit of using AWS CloudTrail?

The primary benefit of using AWS CloudTrail is its ability to enable governance and compliance auditing. CloudTrail helps organizations track and log API calls made within their AWS environment. This extensive logging provides visibility into user activity, resource usage, and regulatory compliance, which is crucial for auditing purposes.

By maintaining a record of all API calls, including who made the call, the time it occurred, and the source IP address, CloudTrail provides valuable insights that help identify potential security issues or compliance gaps. Organizations can leverage these logs for forensic analysis and operational troubleshooting, ensuring they meet industry and regulatory requirements.

The other options address different functionalities of AWS services but do not capture the core purpose of CloudTrail as effectively as governance and compliance auditing. For instance, enhancing data analytics capabilities would be more aligned with services like AWS Glue or Amazon Athena, while increasing storage limits pertains to AWS storage solutions rather than CloudTrail's logging function. Likewise, reducing cloud migration costs is not a direct responsibility of CloudTrail, but rather a consideration in overall cloud strategy and architecture.