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。

• GUI: fixed issue with opening '.vbox' files and it's aliases
• GUI: keyboard grabbing fixes (bugs #15771 and #15745)
• GUI: fix for passing through Ctrl + mouse-click (Mac OS X hosts only; bug #15714)
• GUI: fixed automatic deletion of extension pack files (bugs #11352 and #14742)
• USB: fixed showing unknown device instead of the manufacturer or product description under certain circumstances (5.1.0 regression; bug #15764)
• XHCI: another fix for a hanging guest under certain conditions as result of the fix for bug #15747, this time for Windows 7 guests
• Serial: fixed high CPU usage with certain USB to serial converters on Linux hosts (bug #7796)
• Storage: fixed attaching stream optimized VMDK images (bug #14764)
• Storage: reject image variants which are unsupported by the backend (bug #7227)
• Storage: fixed loading saved states created with VirtualBox 5.0.10 and older when using a SCSI controller (bug #15865)
• Storage: fixed broken NVMe emulation if the host I/O cache setting is enabled
• Storage: fixed using multiple NVMe controllers if ICH9 is used
• NVMe: fixed a crash during reset which could happen under certain circumstances
• Audio: fixed microphone input (5.1.2 regression; bugs #14386 and #15802)
• Audio: fixed crashes under certain conditions (5.1.0 regression; bug #15887 and others)
• Audio: fixed recording with the ALSA backend (5.1 regression)
• Audio: fixed stream access mode with OSS backend (5.1 regression, thanks to Jung-uk Kim)
• E1000: do also return masked bits when reading the ICR register, this fixes booting from iPXE (5.1.2 regression; bug #15846)
• BIOS: fixed 4bpp scanline calculation (bug #15787)
• API: relax the check for the version attribute in OVF/OVA appliances (bug #15856)
• Windows hosts: fixed crashes when terminating the VM selector or other VBox COM clients (bug #15726 and others)
• Linux Installer: fixed path to the documentation in .rpm packages (5.1.0 regression)
• Linux Installer: fixed the vboxdrv.sh script to prevent an SELinux complaint (bug #15816)
• Linux hosts: don't use 32-bit legacy capabilities
• Linux Additions: Linux 4.8 fix for the kernel display driver (bugs #15890 and #15896)
• Linux Additions: don't load the kernel modules provided by the Linux distribution but load the kernel modules from the official Guest Additions package instead (bug #15324)
• Linux Additions: fix dynamic resizing problems in recent Linux guests (bug #15875)
• User Manual: fixed error in the VBoxManage chapter for the getextradata enumerate example (bug #15862)