S3 and Static Hosting — Buckets, Objects, and Presigned URLs
Master AWS S3 for file storage, static site hosting, and secure file sharing with presigned URLs.
Every application needs to store files. User avatars, PDF invoices, CSV exports, image galleries, log archives. You could write files to your server's disk, but the moment you have more than one server — or your server dies — those files are gone.
S3 solves this by giving you a file storage service that is separate from your compute. Files in S3 survive server crashes, auto-scale to petabytes, and can be served directly to users without hitting your application server at all. It is the most-used AWS service for a reason.
Buckets and Objects
S3 organizes files into two concepts:
A bucket is a container. Think of it as a top-level folder with a globally unique name. The name must be unique across all of AWS — not just your account, but every AWS account worldwide. This is because
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