Amazon S3 is an object storage system. Typical use cases include: Backup and storage, application
hosting, media hosting, software delivery and hosting a static website.
You cannot install an operating system on an object-based storage system. Instead, you need a
block-based storage system such as Amazon EBS.
You cannot use Amazon S3 as an in-memory data cache; for this you need a service such as Amazon
ElastiCache.
You cannot use Amazon S3 as a message queue (or at least it is not a typical use case). You
should use a services such as Amazon SQS or Amazon MQ.