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====== Pricing Models ======

**What it is:** The main ways AWS charges for resource usage.

**What it’s for:**
  * Choose the best cost model for your workload pattern.
  * Balance flexibility vs discount.

**Key ideas:**
  * Common models:
    * [[aws:cost:on-demand|On-Demand]]
    * [[aws:cost:reserved-instances|Reserved Instances (RI)]]
    * [[aws:cost:savings-plans|Savings Plans]]
    * [[aws:cost:spot|Spot Instances]]
    * [[aws:cost:free-tier|Free Tier]]

**Exam cues:**
  * “predictable steady workload, want discount” → RI or Savings Plans.
  * “interruptible batch jobs, cheapest” → Spot.

**Hard words (English + IPA + Vietnamese meaning):**
  * *pricing* /ˈpraɪsɪŋ/: định giá
  * *flexibility* /ˌfleksəˈbɪləti/: linh hoạt
  * *predictable* /prɪˈdɪktəbl/: có thể dự đoán
  * *discount* /ˈdɪskaʊnt/: giảm giá