Google Cloud service that creates secure VPN connections between your on-premises network and your Google Cloud VPC. Like creating a secure, encrypted highway tunnel that connects two separate cities.
A retail chain uses Cloud VPN Gateway to securely connect their store systems to inventory management applications running in Google Cloud.
All provide IPsec site-to-site VPN between on-premises networks and a cloud virtual network (VPC/VNet/VCN). Google Cloud uses a Cloud VPN Gateway attached to a VPC; AWS uses a Virtual Private Gateway/Transit Gateway with Site-to-Site VPN; Azure uses VPN Gateway; OCI uses VPN Connect.