Run another system in a window
VirtualBox lets you create a virtual computer on a Windows, macOS, Linux, or Solaris host, then install Windows, Linux, or another operating system inside it. In daily use, this makes it possible to try a Linux environment, test software in a separate Windows machine, or keep an older system available without replacing the host operating system. The guest runs in its own window, and you can remove or reset it without reinstalling the host.
To get started, create a virtual machine, attach an operating-system ISO image, and install the guest as you would on a physical PC. VirtualBox can also perform unattended installations for common Windows and Linux guests, reducing the steps needed to configure a test machine. After installing Guest Additions inside a guest, you can resize its display and use shared folders, a shared clipboard, and drag-and-drop to exchange files or text with the host.
Where the limits matter
Virtual machines share the host computer’s resources, and graphics performance is a particular constraint. VirtualBox is not suited to workloads that depend on fast 3D graphics inside the guest, such as gaming. On Windows, Hyper-V features can also affect performance: when Hyper-V, WSL 2, or Memory Integrity is enabled, VirtualBox may run more slowly. That slowdown is expected in those configurations.
Installation requires administrator privileges because the setup adds virtual network drivers. The network connection is briefly disconnected while those drivers are installed, so it is sensible to avoid starting the process during a task that depends on an uninterrupted connection.
Snapshots, networking, and machine portability
Snapshots save a virtual machine’s state so you can return to it after a failed update, configuration change, or software test. This is useful when experimenting with settings that may make a guest unusable: take a snapshot before the change, then roll back if the result is not suitable. Snapshots do not remove the need to manage the machine’s files, but they provide a practical recovery point for testing.
VirtualBox’s virtual networking options include NAT, bridged, host-only, and internal networks. These modes let you choose how a guest communicates with the host and other machines, which is useful when setting up a software test, server exercise, or lab environment. You can also import and export virtual machines in the open OVF/OVA format to move them between PCs.
Licensing and optional components
Oracle develops VirtualBox. The base package, including Guest Additions installed inside virtual machines, is open source under the GNU GPL v3 and free for any use. The separate Extension Pack is free only for personal and educational use; companies need a paid license for it. Most home users do not need the pack, though it adds features such as a VirtualBox Remote Desktop Protocol server and disk encryption.
Windows 11 guests are supported with TPM and Secure Boot settings provided for what Windows 11 setup expects. A valid Windows license is still required for the guest. For ordinary testing and learning, the base package supplies the core virtual-machine workflow, while the Extension Pack should be installed only when its additional features are needed and the applicable license permits its use.
Preparing a guest for everyday use
After installing an operating system, install Guest Additions from the Devices menu inside that guest. This enables the resizable screen and shared clipboard, along with the other host-to-guest conveniences. These additions make routine tasks—such as copying a command, moving a document, or adjusting the guest window—more straightforward than working with an isolated display and storage setup.
VirtualBox is therefore most practical for development, IT study, and controlled operating-system or software tests where snapshots, virtual networking, and portable machine files are useful. Its graphics limitations and possible Windows virtualization conflicts are important to account for before assigning demanding workloads to a guest.
