Glossary
Also: Data transfer out
Charges for data leaving an AWS region, an availability zone or the cloud. Inbound data is usually free.
The price list is granular: within a zone, across zones, across regions, out to the internet. Spread an application across zones and you pay for every conversation between its parts.
This hits chatty architectures hardest: many small calls between services, logs shipped to another region, backups across region boundaries.
How you notice it
Frequently asked
No. Within an availability zone it is free, across zone boundaries it is charged in both directions. That is exactly what hits architectures spread across three zones for resilience which make many small calls between their parts.