Cloud pricing term
What is Data egress?
Data egress is data leaving a provider or service boundary for a destination that the provider prices as outbound transfer.
The expensive mistake
Treating all network traffic as one free or flat-rate bucket. Internet egress, same-region transfer, inter-region transfer, and load-balancer processing can be separate meters. Apply the included allowance before the overage rate, then keep that transfer charge separate from compute, disk, and IPv4.
Where it appears on your bill
Look for lines such as DataTransfer-Out-Bytes, bandwidth overage, egress, or fast data transfer. Internal and cross-region paths may appear on different lines.
Worked example
The dated example uses AWS t4g.nano at $3.066/month, 100 GB included transfer, and $0.09/GB overage. At 250 GB outbound, max(0, 250 - 100) x $0.09 = $13.50. The known subtotal is $16.566 before EBS and public IPv4.
Example prices checked: