What it is: A change data capture feature that records item-level changes in a DynamoDB table.

What it’s for:

• Trigger downstream processing (often with Lambda).
• Build event-driven architectures (audit, replication, search indexing).

Key ideas:

• Captures inserts, updates, deletes.
• Commonly integrated with Lambda.

Exam cues:

• “run Lambda when table changes” → DynamoDB Streams.

Hard words:

• *change data capture* /tʃeɪndʒ ˈdeɪtə ˈkæptʃər/: bắt thay đổi dữ liệu
• *downstream* /ˌdaʊnˈstriːm/: phía sau (hệ xử lý tiếp theo)
• *event-driven* /ɪˈvent ˈdrɪvn/: hướng sự kiện