A bucket is a named, top-level container in an object storage service that holds objects and carries settings such as region, access permissions, versioning and lifecycle rules.
Why it matters
Buckets are the unit where you control who can read or write data. Bucket names are often globally unique, and the name can appear in URLs, such as my-bucket.s3.amazonaws.com-style endpoints.
Misconfigured buckets are a frequent cause of data leaks, so access settings deserve careful review. Features like versioning and lifecycle rules help recover from deletions and control cost.
Example
A site stores user avatars in a bucket named example-avatars. The bucket is private; the application generates short-lived signed URLs so each user can view only their own picture.
Common mistakes
- Leaving a bucket publicly listable or writable.
- Putting sensitive and public files in one bucket with a single policy.
- Dangling DNS records pointing to a deleted bucket, which can be taken over by others.
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