Platform & DevOps·Traffic into and inside the cluster
your workload calling a payment provider goes out through something with a fixed address, because the provider allow-lists it.
Egress
Also calledoutbound traffic, outbound connectivity
Traffic leaving a cluster or network for the outside world. It is the direction teams forget until two things happen: a third party requires a stable source address to allow-list, and the bill arrives with data-transfer charges on it. Controlling it also matters for security, because unrestricted egress is how a compromised workload reaches a command-and-control host or exfiltrates data.