VirtualBox is a free and open-source virtualization software that allows users to create and run virtual machines on their computers. With VirtualBox, users can install and run multiple operating systems simultaneously on their computer without having to create separate partitions or buy additional hardware.

one of the main advantages of VirtualBox is its ease of use. It is simple to install and set up, even for those who have little or no experience with virtualization technology. VirtualBox also offers a wide range of customization options, including the ability to adjust the amount of RAM, CPU cores, and hard disk space allocated to each virtual machine.

Another great feature of VirtualBox is its compatibility with a wide range of operating systems. Users can install and run Windows, Linux, macOS, and many other operating systems on their virtual machines. This makes it an excellent tool for developers, software testers, and anyone who needs to run multiple operating systems on a single computer.

VirtualBox also offers a range of advanced features, such as support for USB devices, shared folders, and network adapters. These features make it possible to run software that requires hardware or network resources, such as virtual routers, firewalls, and servers.

VirtualBox is an excellent choice for anyone who needs to run multiple operating systems on a single computer. Its ease of use, wide range of customization options, and compatibility with many different operating systems make it a versatile and powerful tool for developers, IT professionals, and home users alike.

Key Feature:

• Cross-platform compatibility.
• Intuitive graphical user interface.
• Support for various operating systems.
• Seamless integration with host operating system.
• Snapshots and clones.
• Networking capabilities.
• Virtual device support.
• Extension packs for additional functionality.

Version 4.3.0 Beta 1

New features:

• VMM: major rewrite of the VT-x code including many bug fixes and performance improvements (for example bug #9659)
• GUI: keyboard shortcuts management (input page of global preferences extended with possibility to edit general keyboard shortcuts for VirtualBox Manager and Virtual Machine)
• GUI: extended messaging mechanism (new non-modal popup overlays used to show non-critical warnings and provide user with additional information)
• GUI: video capturing support (bug #4766)
• GUI: host touch devices support (GUI passes host touch-events to guest)
• Emulated USB touch devices
• VRDP: support for IPv6
• NAT: experimental virtual router mode: several VMs are attached to the same internal network and share one NAT service (see the manual for more information)

In addition, the following items were fixed and/or added:

• VMM: properly handle NMIs on Linux hosts with X2APIC enabled
• GUI: update check uses https
• GUI: lot of internal stuff rewritten (cleanup and bug-fixes)
• Settings: global and per-VM default frontend configuration, useful to select the use of alternative VM frontends
• Settings: limit depth of snapshot tree to 250 levels, as more will lead to decreased performance and may trigger crashes
• Main: new event queue implementation which does not use the host's native event queue for processing VirtualBox events anymore
• Main: use the XDG standard configuration folder instead of .VirtualBox on systems where it is appropriate (bug #5099)
• VBoxManage: list more information about hard disk/DVD/floppy media, and support the --long option to show really all available details
• VBoxManage: added support for optional command line parameters for the automatic Guest Additions update
• VBoxManage: added support for listing active guest sessions, guest processes and/or guest files via guestcontrol list
• VBoxManage: added support for closing active guest sessions via guestcontrol session close --session-id | --session-name |--all
• VBoxManage: added support for terminating active guest processes via guestcontrol process kill|close|terminate --session-id | --session-name ... or guestcontrol [p[s]]kill --session-id | --session-name ...
• VBoxManage: added support for watching guest sessions via guestcontrol watch
• 3D support: several fixes
• 3D support: several fixes for Mac OS X hosts
• OVF: several fixes
• Keyboard: fix for reporting key sequences like Ctrl+Alt+Del for the USB keyboard emulation
• Shared Clipboard/X11: support for BMP-format images, contributed by François Revol
• Windows hosts: don't cause massive DPC latency (bug #6242)
• Windows hosts: consider symlinks when retrieving volume information (bug #11962)
• Windows Additions: fixed misbehavior with guest display power management (WDDM driver only; bug #11170)
• Windows guests: ability to track guest user idle times through the newly introduced event IGuestUserStateChangedEvent