A bucket is a logical unit of storage in Amazon Web Services (AWS) object storage service, Simple Storage Solution S3. Buckets are used to store objects, which consist of data and metadata that describes the data.
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An S3 customer must create a bucket before he can store data in Amazon's public cloud and specify access privileges for the bucket by using the AWS Policy Generator. Although customers are not charged for creating buckets, they are charged for storing objects in a bucket and for transferring objects in and out of buckets.
There is no limit to the number of objects a customer can store in a bucket, but each AWS account can only have 100 buckets at one time.