Amazon Macie
A data security service that uses machine learning to discover and protect sensitive data in S3.
Amazon Macie is a fully managed data security service that uses machine learning to automatically discover, classify, and protect sensitive data stored in Amazon S3. It scans buckets for personally identifiable information (PII), financial records, and credentials, then generates findings with severity ratings so teams can prioritize remediation. The key exam distinction is scope: Macie focuses on data classification within S3, while GuardDuty detects account-level threats like unusual API calls or compromised credentials across the broader environment. A common trap is assuming Macie covers all AWS storage — it works on S3, not EBS or RDS.
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