What is the difference between AWS S3 and EBS?

**Amazon S3 (Simple Storage Service):**
- Object storage — stores files, images, backups, static websites
- Accessible from anywhere over HTTP/HTTPS
- Virtually unlimited storage
- Pay per GB stored + requests
- Cannot be directly attached to EC2 as a drive

**Amazon EBS (Elastic Block Store):**
- Block storage — works like a hard drive attached to EC2
- Only accessible from the EC2 instance it's attached to
- Limited to one AZ
- Pay per GB provisioned
- Used for OS, databases, application data

**Rule of thumb:** S3 for files you share or access via URL. EBS for your EC2's internal storage.