What it is: A preview of changes CloudFormation will make to a stack before applying them.

What it’s for:

• Reduce risk by reviewing what will be created/modified/deleted.
• Improve change control and approvals.

Key ideas:

• You can inspect the change set, then execute it.
• Useful in production environments.

Exam cues:

• “review changes before applying” → change set.

Hard words:

• *preview* /ˈpriːvjuː/: xem trước
• *execute* /ˈeksɪkjuːt/: thực thi
• *approval* /əˈpruːvl/: phê duyệt