S3
- S3 is object based Storage (Not suitable for running OS or DB)
- files can be from from 0B to 5 TB
- Unlimited storage
- Files are stored in buckets
- S3 is a universal namespace
- url example: https://s3-<REGION>.amazonaws.com/<BUCKET-NAME>
- Successful upload = HTTP 200
- S3 is Private (locked down) when created, need to update to make public
- Access Control through Bucket Policies or Access Control List (individual file level)

- Version Control
-- Stores all versions of an object
-- Great Backup tool
-- Once enabled, cannot be disabled (can suspend)
-- Integrateds with livecycle rules
-- Comes with MFA delete capability
-- uploading same file again will be uploaded as private, will update permissions (no longer public)
-- deleting a file is just a new version of the file. can be seen if you hit show versions.

S3 - 6 tiers
- S3 standard
- S3 Infrequently Accessed (IA)
- S3 Intelligent tiering
- S3 1 zone - Infrequently Accessed (IA)
- S3 Glacier
- S4 Glaciar Deep Archive

Athena vs Macie

Athena is an interactive query service which enables you to analyse and query data located in s3 using standard SQL
serverless
pay per TB scanned or per query
can be used to query logs, generate business reports

PII = Personally identifiable information
- home address, email, social security, CC number, DOB, bank etc

Macie is security service that uses Machine Learning and NPL (natural process learning)to identify any PII 
- used to stay PCI compliant etc