VirtualBox是一款免費且開源的虛擬化軟體，允許用戶在電腦上創建和運行虛擬機器。使用VirtualBox，用戶可以在不需要創建單獨的分區或購買額外硬體的情況下，在電腦上同時安裝和運行多個操作系統。

VirtualBox 的主要優勢之一是其易於使用。即使是對虛擬化技術幾乎沒有經驗的人，也可以輕鬆安裝和設置。VirtualBox 還提供廣泛的自定義選項，包括調整分配給每個虛擬機的 RAM、CPU 核心和硬碟空間的能力。

VirtualBox的另一個優點是其與多種作業系統的兼容性。使用者可以在其虛擬機器上安裝和運行Windows、Linux、macOS以及其他許多作業系統。這使得它成為開發人員、軟體測試人員以及需要在單一電腦上運行多個作業系統的人的絕佳工具。

VirtualBox 也提供了一系列的進階功能，如對 USB 設備、共享資料夾和網路配接器的支持。這些功能使得運行需要硬體或網路資源的軟體成為可能，如虛擬路由器、防火牆和伺服器。

VirtualBox 是需要在單一電腦上運行多個作業系統的人的極佳選擇。其易用性、多樣化的自訂選項以及與許多不同作業系統的相容性，使其成為開發人員、IT 專業人士和家庭用戶皆適用的多功能且強大的工具。

關鍵特性：

• 跨平台相容性。
• 直觀的圖形用戶介面。
• 支援各種作業系統。
• 與主機作業系統無縫整合。
• 快照和克隆。
• 網路功能。
• 虛擬設備支援。
• 擴充套件以增加功能。

• 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