====== Route 53 (DNS) ======

**What it is:** AWS’s DNS service that translates domain names to IP addresses or AWS endpoints.

**What it’s for:**
  * Host and manage DNS records for domains.
  * Route users to the right endpoints (ALB, CloudFront, S3 website, etc.).
  * Perform health checks and intelligent routing.

**Key ideas:**
  * Uses **hosted zones** (public/private).
  * DNS records include A/AAAA/CNAME and alias records for AWS resources.

**Exam cues:**
  * “need DNS for domain” → Route 53.
  * “route traffic based on health checks” → Route 53 + routing policy.

**Hard words:**
  * *DNS* /ˌdiː en ˈes/: hệ thống tên miền
  * *domain* /doʊˈmeɪn/: tên miền
  * *hosted zone* /ˈhoʊstɪd zoʊn/: vùng quản lý DNS
  * *record* /ˈrekərd/: bản ghi DNS