AWS component that allows resources in a VPC to connect to the internet. Like the main door of a building that connects the inside to the outside world.
Web servers in a public subnet use an Internet Gateway to serve websites to users on the internet.
AWS and OCI both use 'Internet Gateway' to connect VPC resources to the internet. Azure uses 'Virtual Network Gateway' for similar connectivity, while GCP uses 'Cloud Router' to manage network traffic between VPC and the internet.