All 7 S3 & Storage questions
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What are the different S3 storage classes, and how do you choose the right one for a specific type of data? How do S3 lifecycle policies automatically transition objects between storage classes or delete them entirely based on defined rules? How do S3 bucket policies and access control lists work together to control who can access objects stored in a bucket? What is S3 versioning, and how does it help protect against accidental object deletion or overwrite? How does S3 Object Lock support compliance requirements for write once read many, or WORM, data storage? How can S3 Multi-Region Access Points and Cross-Region Replication support building a resilient, low latency, globally distributed storage architecture?
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What is Amazon S3 and what makes it well suited for storing virtually unlimited amounts of data?

Beginner

Answer

Amazon S3, or Simple Storage Service, is an object storage service that lets you store and retrieve virtually unlimited amounts of data, such as files, images, videos, and backups, offering extremely high durability by automatically storing multiple copies of your data across multiple Availability Zones, along with a simple API that makes it easy to integrate with countless other AWS services and applications.
aws s3 cp myfile.txt s3://my-bucket/myfile.txt
Real-world example A company stores millions of customer uploaded documents in S3, relying on its virtually unlimited scalability and high durability rather than needing to plan and provision their own storage hardware capacity in advance.

Common follow-ups: What is the difference between object storage and traditional file or block storage?;How durable is data stored in S3 according to AWS's published durability guarantee?

Amazon CloudFront & Content Delivery;AWS Backup & Disaster Recovery
All 7 S3 & Storage questions