We're still talking about different things: In S3, for an object known as s3://foo/bar, "bar" is the key. See eg https://docs.aws.amazon.com/AmazonS3/latest/use

We're still talking about different things: In S3, for an object known as s3://foo/bar, "bar" is the key. See eg https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-keys.html https://docs.aws.amazon.com/AmazonS3/latest/userguide/object... So the title is ambiguous, it could mean that keys have to be unique across buckets since they share the same namespace.