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Amazon S3 at 18: Why AWS's First Storage Service Still Powers the Cloud

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Amazon S3 (Simple Storage Service), launched in 2006 as one of AWS's earliest offerings, remains a foundational component of modern cloud infrastructure. The object storage service stores data as objects inside buckets, supports individual files up to 5 TB, and guarantees 99.999999999% durability by replicating data across at least three availability zones. Unlike traditional file systems such as EBS or EFS, S3 offers unlimited capacity with no provisioning required and natively integrates with over 200 AWS services. It supports multiple storage classes — from S3 Standard for frequently accessed data to Glacier Deep Archive for long-term retention — allowing teams to balance cost against access needs. S3 is widely used as the backbone of data lakes, static website hosting, backup storage, and machine learning pipelines on AWS.

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