What is the use of VirtualBox?

VirtualBox is a powerful virtualization software that allows users to run multiple virtual machines on a single physical host computer. Some of the key uses and benefits of using VirtualBox include:

Test New Operating Systems

One of the most common uses of VirtualBox is to test new operating system versions without having to install them directly on hardware. For example, you can install Windows 11 or the latest Linux distribution in a VirtualBox virtual machine to test compatibility and features before deploying to actual systems. This allows risk-free testing without impacting day-to-day use of your physical machine.

Run Software Designed for Other Operating Systems

VirtualBox allows you to virtualize older operating systems like Windows XP or Windows 7 to run legacy software that may not work properly on newer host OS versions. You can also virtualize macOS on a Windows host to run Mac-only apps. This provides flexibility and access to a broader range of software.

Isolate Applications and Services

Virtual machines can provide isolation for specific applications or services. For example, you could run web servers, databases, email servers, etc. in separate VMs to better secure and compartmentalize these services. This also allows for finer resource allocation tuning.

Test Software in Controlled Environments

QA engineers and developers can leverage VirtualBox to create tailored test environments for applications and software. Custom OS, software, and hardware configurations can be instantiated as needed to thoroughly test software builds for issues before release.

Train Staff on New Systems

IT departments in corporate environments often use VirtualBox to provide training systems to help teach new employees how to use software without providing them direct access to physical systems. This reduces risk of mistakes during the learning process.

Key Features of VirtualBox

Some of the standout features that enable these productive uses include:

Open Source Software

VirtualBox is open source virtualization software released under the GNU General Public License (GPL). This provides free access and transparency to the software codebase.

Cross-Platform Compatibility

VirtualBox runs on Windows, Linux, macOS, and Solaris host operating systems. This allows you to virtualize a diverse range of guest OS options. VirtualBox also supports older Windows versions like XP and Vista for legacy app testing.

Powerful Virtualization Capabilities

VirtualBox provides full virtualization of processors, memory, graphics, storage, and networking. Guest VMs get excellent hardware support and compatibility. Features like 3D graphics support and shared folders allow seamless usage.


You can take snapshots of VM states and revert back to them later. This is extremely useful for testing software updates, configuration changes, and overall system troubleshooting. Snapshots provide a critical undo capability.

Remote Machine Management

The VirtualBox Remote Desktop Protocol (RDP) allows you to access and control guest VMs remotely over a network. Combined with SSH access, you can manage VMs headless.


VirtualBox provides an Import/Export feature to package VMs into .OVF files. These can be easily copied and imported on other VirtualBox instances. This makes migrating VMs straightforward.

Customization and Automation

You can customize and automate VM deployment using the command-line interface. This allows VirtualBox use in DevOps pipelines and scripted testing scenarios. The CLI also provides lower-level configuration access.

Extensive Hardware Device Support

VirtualBox has interfaces for USB, serial, parallel, webcam, audio, disk encryption, and more. Advanced users can tailor hardware access to meet specific virtualization needs. Networking options like NAT, bridging, internal, and host-only provide flexible connectivity.

Active Development and Community

VirtualBox has been under active development for over 15 years. The open source community continues improving the software and fixing issues. This provides continuity and continued innovation of the platform.

Use Cases and Examples

Some specific examples and use cases where VirtualBox shines include:

Web Developers Testing Sites in Different Browsers and OS Versions

Web developers can spin up VMs running older OS and browser versions to test site compatibility. You can simulate a Windows 7 IE8 user or macOS Safari user to catch cross-browser issues.

Software Engineers Testing Backwards Compatibility

Software engineers working on new versions of applications can leverage VirtualBox to run older OSes and dependency stacks to check backwards compatibility. This is critical for apps with a long legacy.

Sysadmins Prototyping Server Configurations

Sysadmins can test things like networking and disk configurations, OS patching, backup/restore, etc. within VirtualBox VMs without affecting production systems. This provides a safe sandbox.

Security Researchers Analyzing Malware

Security teams can isolate and detonate malware samples within disposable VirtualBox VMs to analyze their behavior and payloads safely. This helps strengthen defenses.

IT Technical Trainers Providing Hands-On Experience

IT departments use VirtualBox to provide customized environments that allow new hires to gain hands-on experience with software and tools relevant to their roles, from ERP systems to service desk portals.

Sales Engineers Demonstrating Software

Sales engineers can configure VMs on laptops tailored to demoing their company’s software in order to showcase capabilities to prospects during the sales process.

Developers Testing Automation Scripts

Test automation engineers can programmatically stand up disposable test environments using VirtualBox to validate installation scripts, configuration management code, and deployment pipelines.

Performance and Resource Considerations

While very capable, VirtualBox does have hardware resource requirements that should be accounted for, especially when virtualizing heavier OSes and apps.

Some key considerations include:


You should have at least 2GB RAM allocated to each VM, 4GB or more for heavier uses like Windows and Linux desktops. Inadequate RAM will lead to poor performance.


Ideally a processor with hardware acceleration for virtualization like Intel VT-x or AMD-V. Multi-core CPUs provide ability to run more concurrent VMs.


SSD or NVMe storage will provide much better I/O performance for VMs compared to HDD. Use a high speed interface like SATA III or USB 3.

Video Memory

If running desktop OSes, allocate at least 128MB+ of video memory for smooth graphics performance and effects.

Make sure the host OS and active VMs don’t overload the physical resources. Monitor usage with tools like top/htop and VirtualBox’s built-in diagnostics.

Alternatives to VirtualBox

Some other popular alternatives for virtualization beyond VirtualBox include:

VMware Workstation/Fusion

VMware’s desktop virtualization products have some of the best performance and hardware compatibility. But they are paid proprietary software.


Microsoft’s hypervisor comes free with Windows. It provides tight integration and works seamlessly for virtualizing Windows guests. Limited host OS support.

Parallels Desktop

Focuses on Mac hardware and integrates tightly with macOS. Makes it very easy to run Windows apps on macOS.


The Kernel-based Virtual Machine is a built-in Linux technology for hypervisor-based virtualization. Great native performance on Linux.

Proxmox VE

Proxmox packages KVM with a web-based management GUI and additional server virtualization features like clustering.

Each option has pros and cons based on use cases. VirtualBox provides the best mix of free use, cross-platform support, and mature feature set for personal and professional applications.


In summary, VirtualBox is an extremely capable and versatile virtualization platform. The ability to robustly virtualize operating systems provides a multitude of beneficial testing, development, training, and troubleshooting use cases. The open source nature provides transparency and community support, while continual development efforts keep improving the software. With its solid feature set and smooth performance, VirtualBox remains one of the best free solutions for virtualization needs on Windows, Linux, and macOS systems.