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