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.

• VMM: another TLB invalidation fix for non-present pages
• VMM: fixed a performance regression (4.2.8 regression; bug #11674)
• GUI: fixed a crash on shutdown
• GUI: prevent stuck keys under certain conditions on Windows hosts (bugs #2613, #6171)
• VRDP: fixed a rare crash on the guest screen resize
• VRDP: allow to change VRDP parameters (including enabling/disabling the server) if the VM is paused
• USB: fixed passing through devices on Mac OS X host to a VM with 2 or more virtual CPUs (bug #7462)
• USB: fixed hang during isochronous transfer with certain devices (4.1 regression; Windows hosts only; bug #11839)
• USB: properly handle orphaned URBs (bug #11207)
• BIOS: fixed function for returning the PCI interrupt routing table (fixes NetWare 6.x guests)
• BIOS: don't use the ENTER / LEAVE instructions in the BIOS as these don't work in the real mode as set up by certain guests (e.g. Plan 9 and QNX 4)
• DMI: allow to configure DmiChassisType (bug #11832)
• Storage: fixed lost writes if iSCSI is used with snapshots and asynchronous I/O (bug #11479)
• Storage: fixed accessing certain VHDX images created by Windows 8 (bug #11502)
• Storage: fixed hang when creating a snapshot using Parallels disk images (bug #9617)
• 3D: seamless + 3D fixes (bug #11723)
• 3D: version 4.2.12 was not able to read saved states of older versions under certain conditions (bug #11718)
• Main/Properties: don't create a guest property for non-running VMs if the property does not exist and is about to be removed (bug #11765)
• Main/Properties: don't forget to make new guest properties persistent after the VM was terminated (bug #11719)
• Main/Display: don't lose seamless regions during screen resize
• Main/OVF: don't crash during import if the client forgot to call Appliance::interpret() (bug #10845)
• Main/OVF: don't create invalid appliances by stripping the file name if the VM name is very long (bug #11814)
• Main/OVF: don't fail if the appliance contains multiple file references (bug #10689)
• Main/Metrics: fixed Solaris file descriptor leak
• Settings: limit depth of snapshot tree to 250 levels, as more will lead to decreased performance and may trigger crashes
• VBoxManage: fixed setting the parent UUID on diff images using sethdparentuuid
• Linux hosts: work around for not crashing as a result of automatic NUMA balancing which was introduced in Linux 3.8 (bug #11610)
• Windows installer: force the installation of the public certificate in background (i.e. completely prevent user interaction) if the --silent command line option is specified
• Windows Additions: fixed problems with partial install in the unattended case
• Windows Additions: fixed display glitch with the Start button in seamless mode for some themes
• Windows Additions: Seamless mode and auto-resize fixes
• Windows Additions: fixed trying to to retrieve new auto-logon credentials if current ones were not processed yet
• Windows Additions installer: added the /with_wddm switch to select the experimental WDDM driver by default
• Linux Additions: fixed setting own timed out and aborted texts in information label of the lightdm greeter
• Linux Additions: fixed compilation against Linux 3.2.0 Ubuntu kernels (4.2.12 regression as a side effect of the Debian kernel build fix; bug #11709)
• X11 Additions: reduced the CPU load of VBoxClient in drag'and'drop mode
• OS/2 Additions: made the mouse wheel work (bug #6793)
• Guest Additions: fixed problems copying and pasting between two guests on an X11 host (bug #11792)