Mapping Windows PC to virtual box linux terminal

Hi All,
How to map our windows file system with the linux terminal. For example, i was going through spark videos posted by Durga, he downloaded scala, file was in Downloads folder in PC(Mac/Windows). But he was accessing downloads folder from terminal. Then he moved the downloaded file to his root directory in terminal.

So the question is, how to map the PC file system in linux terminal?

Thanks and Regards,
Prabhu Muthaiyan