What it is: Keeping multiple versions of an object in the same bucket.

What it’s for:

• Protect against accidental deletes/overwrites.
• Enable recovery to a previous version.

Key ideas:

• When enabled, deletes create a delete marker rather than removing all versions.
• Versioning helps with rollback and audit.

Exam cues:

• “recover deleted object” → enable versioning.
• “protect from overwrites” → versioning.

Hard words:

• *overwrite* /ˌoʊvərˈraɪt/: ghi đè
• *marker* /ˈmɑːrkər/: dấu đánh dấu
• *rollback* /ˈroʊlˌbæk/: quay lui phiên bản