====== AZ Rebalance (Auto Scaling) ======

**What it is:** An Auto Scaling behavior that maintains balanced instance distribution across enabled Availability Zones.

**What it’s for:**
  * Keep capacity balanced across AZs for better availability.
  * Recover from manual termination or AZ capacity differences.

**Key exam fact:**
  * During rebalancing, Auto Scaling **launches new instances before terminating old ones** to avoid impacting availability.

**Hard words (English + IPA + Vietnamese meaning):**
  * *rebalance* /ˌriːˈbæl.əns/: cân bằng lại
  * *unbalanced* /ʌnˈbælənst/: bị lệch/mất cân bằng
  * *availability* /əˌveɪləˈbɪləti/: tính sẵn sàng