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When objects are stored a “HTTP/1.1 200 OK” response is probided by S3 API endpoint
It uses Cycling Redunadncy Checks to see corruption and fix.

S3 Standard

• has a milliseconds first byte latency(very fast delivery) and object ca be made publicly available
• price per 1000 request

S3 Standard-IA

• per GB data retrieval fee, overall cost increase with frequent data access
• has a minimum capacity charge of 128KB per object
• has minimum duration charge of 30 days (like, you will still be charge worth of 30 days even if you retreive the data before its 30 days renewal period)

S3 One Zone-IA

• has minimum duration charge of 30 days
• only has one az
• retreival fee per GB exist
• cheapest classes

S3 Glacier-Instant

• retreival fee
• minimum duration charge is 90 days
• millisecond access
• 3az

S3 Glacier-Flexible

• 3az
• storage cost is cheap
• cold obj (not immediately availble)
• require retrieival process
• minuite to hour to retreive

S3 Glacier-Deep Archive

• 40KB min billable size
• 180 Day min billable duration
• retreival take longer than flexible
• first byte latency: hours to days

S3 Intelligent-Tiering

• divided by tiers;frequenct access, infrequent access, archive instant access, archive access, deep archive
• it monitors object usuage and automatically assign which tier it goes into
• As objects are access they’re moved back to the frequent access tier. There are no trieval fees for accessing objects
• has monitoring, automation cost
• good for when usuage is changing