S3 buckets can be used to store all kinds of objects, not just for website assets such as JavaScript, CSS, or image files. It can also be used to store other sensitive files from your AWS systems, such as log files or backups. As such, they are by default set to be private when created.
Private buckets configuration ensures objects in these buckets which are not meant for public consumption are not accessible to everyone. You can create S3 bucket to securely and privately store your files from the S3 dashboard in the AWS console.
Related: AWS S3 Management Console
The name must be unique regardless of regions. You'll get an error when trying to use bucket name already being used anywhere within S3
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