Research: Gateway/Ingress. Once requests are past it, are all communications considered secure?

Conduct Research on Gateway/Ingress and create a writeup that explains the concept and how it will be used

Starting Link: https://istio.io/latest/docs/tasks/traffic-management/ingress/ingress-control/#:~:text=An%20ingress%20Gateway%20describes%20a,include%20any%20traffic%20routing%20configuration