What it is: Object storage for files (objects) stored inside buckets.

What it’s for:

• Store static assets (images, videos, PDFs), backups, logs.
• Build data lakes and durable storage.
• Host static websites (in some cases).

Key ideas:

• Core concepts: Bucket and Object.
• Access control: IAM + Bucket Policy.
• Encryption options: Encryption.
• Lifecycle and storage classes reduce cost.

Exam cues:

• “store files with high durability” → S3.
• “static content for global users” → S3 + CloudFront.

Hard words (English + IPA + Vietnamese meaning):

• *object* /ˈɑːbdʒekt/: đối tượng (file + metadata)
• *durability* /ˌdʊrəˈbɪləti/: độ bền dữ liệu
• *static* /ˈstætɪk/: tĩnh (không thay đổi theo request)
• *bucket* /ˈbʌkɪt/: “thùng” chứa object

Child pages:

• Bucket
• Object
• Storage Classes
• Versioning
• Lifecycle Rules
• Encryption (SSE-S3 / SSE-KMS)
• Bucket Policy
• Pre-signed URL
• S3 Glacier