S3(Simple Storage Service)是 AWS 的对象存储服务——以耐久且可扩展的方式存储几乎任何大小和数量的文件(对象),并可通过互联网访问。它是 AWS 最常用的服务之一,非常适合文件、备份、静态资产、数据湖等。
S3 是什么
S3 stores OBJECTS (files + metadata) in BUCKETS (containers):
→ store ANY amount of data, files of any type (up to 5TB each)
→ highly DURABLE (99.999999999% — "11 nines") and available
→ accessed via APIs/URLs (not a filesystem — it's object storage, key→object)
→ virtually unlimited scale; pay for what you store and transfer
关键概念
BUCKET → a container for objects (globally-unique name)
OBJECT → a file + metadata, identified by a KEY (its name/path in the bucket)
KEY → the object's unique identifier within a bucket (e.g. "images/photo.jpg")
STORAGE CLASSES → tiers by access/cost: Standard, Infrequent Access, Glacier (archival)
