A logically isolated section of a cloud provider's network where you launch resources with full control over IP ranges, subnets, route tables, and network gateways — your own private network in the public cloud.
VPCs let you design network topology like an on-premise data center but in the cloud: choose CIDR blocks, divide into public and private subnets across multiple availability zones, configure internet gateways (for public-facing resources) and NAT gateways (for private resources to reach the internet for updates). Security groups (instance-level firewalls) and NACLs (subnet-level firewalls) layer access controls. The default network primitive for any non-trivial AWS, GCP, or Azure deployment.
Designing a 3-tier app's VPC with public subnets for load balancers, private subnets for app servers, and isolated subnets for the database — clean network segmentation.
VPC design happens once at the start of a cloud build and constrains everything downstream — small mistakes (overlapping CIDR with on-prem, undersized subnets) become expensive years later.
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