AWS S3 is THE cloud storage service provided by AWS. The following resources should allow you to dive deeper into it. As always, don't forget to also check the pricing to estimate what you're going to pay (if anything).

AWS S3 Overview: https://aws.amazon.com/s3/

AWS S3 Developer Guide: ^http://docs.aws.amazon.com/AmazonS3/latest/dev/Welcome.html

AWS S3 Permissions: http://docs.aws.amazon.com/AmazonS3/latest/dev/s3-access-control.html

AWS S3 Static Website Hosting: http://docs.aws.amazon.com/AmazonS3/latest/dev/WebsiteHosting.html

AWS S3 Pricing: https://aws.amazon.com/s3/pricing/