This book is a guide on how to use VirtualBox. It begins by guiding you on how to get started with VirtualBox by installing and configuring it in Linux, Windows, Mac OS X, and Solaris platforms. You are then guided on how to create your first virtual machine in the VirtualBox. The process of creating a Hadoop cluster in VirtualBox is also discussed. This has been explained in a step-by-step manner to help you grasp every concept. With VM groups, one can group together virtual machines. With this, a single action can be applied to all the virtual machines which are contained in the group. This book guides you on how to create a VM group in VirtualBox. You are also shown how to emulate a network by use of common networking devices such as routers and PCs in a VirtualBox. The VirtualBox extension pack is very essential, as it helps us accomplish much in a VirtualBox. This book teaches you how to install and set it up in VirtualBox. The book also guides you on how you can share folders between the guest and the host in a VirtualBox. The process of adding new drives to the virtual machines is explored. The following topics are discussed in this book: - Getting Started with VirtualBox- Creating the First Virtual Machine- Creating a Hadoop Cluster- Creating and Managing VM Groups- Emulating a Network in VirtualBox- Installing VirtualBox Extension Pack- Sharing Folders between Host and Guest in VirtualBox - Adding a New Drive to Virtual Machine