What is virtual private cloud?

Answer:

A virtual private cloud (VPC) is the logical division of a service provider's public cloud multi-tenant architecture to support private cloud computing in a public cloud environment.
Just as a virtual private network (VPN) provides secure data transfer over the public Internet, a VPC provides secure data transfer between a private enterprise and a public cloud provider, ensuring that each customer's data remains isolated from every other customer's data both in transit and inside the cloud provider's network.
This can be accomplished through the use of security policies requiring some -- or all -- of the following elements: encryption, tunneling, private IP addressing or allocating a unique VLAN to each customer