Macie

Amazon Macie uses machine learning to automatically discover, classify, and protect sensitive data stored in Amazon S3, identifying personally identifiable information (PII), financial data, and credentials. It surfaces findings through AWS Security Hub or Amazon EventBridge for remediation, making it a natural gate before raw S3 data feeds AI/ML pipelines so training datasets reach Amazon SageMaker or Bedrock scrubbed of sensitive content. The exam distinction is scope: Macie is S3-specific, not general data-loss prevention. Don’t confuse it with AWS Glue (data cataloging) or Amazon Comprehend (runtime NLP entity detection in text); Macie handles pre-training data hygiene and ongoing S3 compliance monitoring.