What it is: A managed registry to store, version, and retrieve container images (Docker images).

What it’s for:

• Store images privately for deployments (ECS/EKS/Fargate).
• Control access with IAM.
• Integrate with CI/CD pipelines.

Key ideas:

• Repositories store images and tags.
• IAM controls who can push/pull.
• Often paired with ECS/EKS.

Exam cues:

• “private Docker image registry” → ECR.
• “store container images for ECS tasks” → ECR.

Hard words (English + IPA + Vietnamese meaning):

• *registry* /ˈredʒɪstri/: kho đăng ký (nơi lưu image)
• *repository* /rɪˈpɑːzətɔːri/: kho chứa (repo)
• *image* /ˈɪmɪdʒ/: ảnh (gói phần mềm container)
• *tag* /tæɡ/: nhãn phiên bản