What it is: Event sources that invoke (call) a Lambda function.
What it’s for:
Common triggers (exam staples):
S3 events (ObjectCreated)
DynamoDB Streams
-
EventBridge schedules/rules
SQS messages / SNS notifications
Key ideas:
A trigger defines when Lambda runs.
Some triggers push events to Lambda; others Lambda polls (e.g., SQS) (conceptually).
Exam cues:
Hard words:
*invoke* /ɪnˈvoʊk/: gọi chạy (hàm)
*event source* /ɪˈvent sɔːrs/: nguồn sự kiện
*poll* /poʊl/: thăm dò (hỏi định kỳ)