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: fixed restoring of the auxiliary TSC MSR in VT-x that caused host BSODs on Windows 8.1 hosts and unpredictable behavior on other hosts (bug #12237)
• VMM: provide fake values for a couple of MSRs to make more guests happy on certain hosts
• VMM: fixed detection of VT-x on certain machines where the BIOS would not set the VMX LOCK feature bit, which affected the VM settings in the GUI
• VMM: fixed TPR threshold which caused BSODs on Windows XP guests that use the I/O APIC (VT-x only; bug #12227)
• VMM: fixed PATM saved state incompatibility for software virtualized VMs (bug #12222)
• VMM: don't fail if AMD-V isn't available if the VM is configured to use software virtualization
• GUI: fixed guest resize breakage on visual representation mode change (when switching from normal to fullscreen etc)
• GUI: make sure the guest screen is resized after restoring a VM from a saved state if the host screen size changed
• GUI: disabled SCROLL LED sync from HID LEDs synchronization (Mac OS X hosts only)
• Webcam passthrough improvements including GUI support (see the manual for more information)
• Guest Control: implemented more IGuestSession methods
• Guest Control: added support for deleting and renaming guest files + directories in VBoxManage
• Guest Control: various bugfixes
• API: incorrect handling of hardware UUID default value, resulting in an all zero DMI/SMBIOS UUID, which leads to Windows requesting re-activation (4.3 regression; bug #12244)
• 3D support: fixed crash on shutdown if 2D video acceleration is enabled (Mac OS X hosts only)
• 3D support: miscellaneous fixes
• Storage: fixed detection of CD/DVD media when switching from an empty to a host drive with passthrough enabled
• Storage: fixed hang of the VM process when the disk is full under certain circumstances
• NAT: listen for changes of NAT Network setting at runtime
• NAT: NAT Network DHCP server now saves leases to a persistent storage
• Main: monitor changes in host DNS configuration
• Mac OS X host: reworked a mechanism of adding a VM desktop alias from the VM selector
• Mac OS X installer: remove old kernel extensions during upgrade (bug #12258)
• Linux Additions: correctly set umask before installing (bug #12166)
• X11 Additions/3D: fix freezes starting 3D desktop (bug #11503, thank you Sam Spilsbury)
• X11 Additions/3D: fix depth buffer support (bug #11905)
• X11 Additions/3D: fix Age Of Empires 3 rendering (bug #11331)
• Windows Additions/3D: fix Google Earth plugin rendering
• Windows Additions/WDDM: autoresize fixes