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 32-bit FPU state on 64-bit capable VMs and restoring guest FPU in raw-mode VMs
• GUI: properly restore normal/scale mode guest-screen size after exiting full-screen/seamless mode
• GUI: mini-toolbar should provoke less artifacts/conflicts with 3D guest rendering
• GUI: Mac OS X: Native full-screen multi-screen transition was able to blackout host-screens for nearly minute
• GUI: X11: Modern window managers should now use native full-screen multi-screen mapping API
• GUI: added extradata item for configuring the mouse capture behavior, see the manual for more information
• Storage: fixed a VBoxSVC crash when querying an iSCSI target with authentication configured
• Storage: fixed a rare data corruption during reads if another allocating write is running concurrently and accesses the same range
• Storage: fixed a rare crash for certain VHD images from other products
• Storage: fixed a rare release assertion when using the AHCI controller
• Floppy: fixed read errors and guest memory corruption when running under control of QEMM
• 3D: added experimental support for rendering on offline GPUs for Mac OS X host
• 3D: fixed white window appearing on entering FullScreen mode on OSX host
• 3D: fixed video recording support for 3D data regression
• 3D: fixes for MS Office 2013 support
• 3D: several fixes
• Bridged Networking: improved IPv6 support when bridging to a wireless interface
• NAT: prevent internal DNS service from stuck in host-resolver mode when host was switched from one network to another one while host was sleeping
• NAT: preserve DF (if possible) and TOS when proxying outbound UDP datagrams
• NAT: don't let multicast datagrams out
• NAT: fixed handling of large incoming UDP datagrams on Windows hosts
• NAT: fixed handling of the RFC 1533 DHCP PAD option
• NAT Network: fixed inbound half-close on Windows hosts
• NAT Network: preserve IPv4 DF (if possible), TTL, TOS and IPv6 Hop Limit when proxying outbound UDP datagrams
• VRDP: fixed a rare crash when using remote audio input
• USB: fixed several regressions from 4.3.14
• Audio: made the HDA sound emulation work with certain OSX guests (e.g. Mountain Lion)
• Windows hosts: fixed startup problems on certain Windows hosts due to conflicts with anti-virus software
• Windows hosts: fixed 4.3.14 regression whereby AltGr stopped working for some people
• X11 hosts: made the extra key on Brazilian Thinkpads work
• X11 hosts: fixed a problem of input focus cycles and immediately released key presses in full screen mode
• Linux hosts: fixed flooding the kernel log with USB related messages when passing through certain USB devices to a VM
• Linux guests: stop applications crashing when drm_wait_vblank is called
• Linux guests: fix a crash in gnome-session
• X11 guests: do not start VBoxClient over an SSH connection
• X11 guests: added support for X.Org Server 1.16
• X11 guests: fixed a wrong parameter in the video driver which caused problems with full-screen X11 clients
• VirtualKD: introduced stub/loader device for speeding up Windows kernel debugging