A logically isolated network section within a cloud provider that allows secure communication between resources.
Azure Virtual Network lets you create private networks in the cloud with custom IP address ranges.
All provide a logically isolated, private network in the cloud with IP ranges, subnets, routing, and security controls. Key differences include GCP VPC being global (subnets are regional) while AWS/Azure/OCI are primarily regional constructs, and each integrates with its own firewall/security and connectivity services.