Final answer:
The data retention period for DynamoDB Streams is 24 hours, after which the data is automatically deleted.
Step-by-step explanation:
The data retention period for DynamoDB Streams is 24 hours. This means that the stream records are accessible for up to 24 hours after the data modification occurs in the DynamoDB table. After this duration, the data is no longer accessible and is automatically deleted by the service. As a managed service, Amazon DynamoDB Streams is designed to capture changes made to items in a DynamoDB table, with applications typically processing these stream records in real-time using AWS Lambda or other processing mechanisms.