Hey there, let's break down your questions about Amazon S3 clearly:

1. Is Amazon S3 a file storage service or a database? #

Amazon S3 is definitely an object/file storage service, not a database. Here's the breakdown:

• It’s built to store unstructured data (think images, videos, documents, backups, raw logs, etc.) as discrete "objects"—each with a unique key, customizable metadata, and the actual data payload.
• Unlike databases (whether relational or NoSQL like DynamoDB), S3 doesn’t support structured querying, transactional operations, or relational data modeling. You interact with it by uploading, downloading, or deleting objects using their unique keys, not by running SQL-like queries or managing table relationships.
• While it falls under the broader "file storage" umbrella, it’s technically an object storage service—a specialized category that offers far greater scalability and durability than traditional file systems for massive volumes of unstructured data.

2. Does S3 store files in a file system or DynamoDB? #

S3 has its own dedicated, distributed storage architecture—it doesn’t rely on DynamoDB or any external database/file system to hold your objects.

• AWS built S3 from scratch as a highly resilient, scalable object storage system. Your files/objects are stored across multiple geographically distributed data centers within AWS regions, with built-in redundancy to guard against data loss.
• DynamoDB is a separate NoSQL database service, designed for low-latency access to structured data. While you can use DynamoDB alongside S3 (e.g., storing metadata about S3 objects in DynamoDB for faster lookup), S3’s actual object data lives entirely in its own proprietary storage infrastructure.

内容的提问来源于stack exchange，提问作者Amar Gohil