====== DynamoDB Streams ======

**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