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Amazon Macie is a data security service that helps you discover and protect sensitive data in your Amazon S3 buckets. It automatically discovers sensitive data like personally identifiable information (PII) and automatically classifies it according to your organization's policies. Macie provides alerts when sensitive data is accessed, shared, or modified, allowing you to quickly identify and remediate potential security risks. In short, Macie helps you maintain compliance and protect your sensitive data in the cloud.