A Virtual Private Cloud (VPC) is a private network interface for collections of DigitalOcean resources. VPC networks provide a more secure connection between resources because the network is inaccessible from the public internet and other VPC networks. Traffic within a VPC network doesn’t count against bandwidth usage.
VPC is available at no additional cost.
Traffic between your resources inside of a VPC network does not count against your bandwidth billing transfer allowance. Traffic from one VPC network to another VPC network uses a public interface and does count against your bandwidth allowance.
VPC networks can vary in size from /28 up to /16. The default size is /20.