What is Amazon S3 and what are its key features?
💡 Model Answer
Amazon S3 is a highly scalable, durable, and cost‑effective object storage service. Key features include: 1) 99.999999999% durability and 99.99% availability; 2) Unlimited storage capacity; 3) Multiple storage classes (Standard, Intelligent‑Tiering, Standard‑IA, One Zone‑IA, Glacier, Glacier Deep Archive) for cost optimization; 4) Versioning to preserve, retrieve, and restore every version of an object; 5) Lifecycle policies to automate transitions and expiration; 6) Server‑side encryption (SSE‑S3, SSE‑KMS, SSE‑C) and client‑side encryption; 7) Access control via IAM policies, bucket policies, ACLs, and S3 Access Points; 8) Event notifications to trigger Lambda, SNS, or SQS; 9) Integration with other AWS services such as Athena, Redshift Spectrum, EMR, and CloudFront. These features make S3 the backbone of many data lakes, backup solutions, and static website hosting.
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