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 #UD exception for 64-bit guests with the EFER.SCE bit and the SYSCALL instruction (VT-x only; 4.3 regression; bug #13008)
• VMM: fixed timekeeping after resuming SMP guests
• VMM: properly wake up a halted VCPU on NMI/SMI
• GUI: fixed a potential crash
• GUI: fixed stuck AltGr key on Windows hosts
• GUI: fixed a potential error during the version check
• GUI: shortcut change should not require Enter/Return (or other trigger) to confirm
• GUI: fixed update check which was broken due to changing the location of the root certificates
• VBoxManage: fixed typo in showvminfo --machinereadable
• NAT: fixed inbound half-close
• NAT: fixed slow upload speed under certain conditions
• NAT Network: fixed potential loss of inbound TCP data
• NAT Network: fixed potential infinite stalls of TCP connections over IPv6
• NAT Network: fixed resets of TCP connections on Windows hosts
• NAT Network: fixed inbound half-close on Mac OS X hosts
• NAT Network: fixed socket leak on Solaris hosts
• NAT Network: fixed ping of mapped host loopback on Mac OS X and Solaris hosts, fixed proxying of IMCP errors on Mac OS X
• Host-Only Network: fixed SNMP ifConnectorPresent value on Windows
• Storage: fixed a possible crash with CD/DVD passthrough under certain circumstances
• Storage: fixed a crash when trying to open an inaccessible QED or QCOW image
• Storage: fixed data corruption or read errors under rare circumstances
• AHCI: fixed a crash under rare circumstances
• USB: performance fixes
• ICH9: properly reset MSI capability on resetKeyboard: active modifier keys during suspend were stuck after resuming the host
• 3D: fixed misbehavior with huge guests (i.e. guest more than 4GB guest memory
• 3D: several fixes
• API: properly detect the Windows 8.1 guest OS type
• ExtPack: cleanup of dangling uninstallation directories
• Linux hosts / guests: compile fix for EL7
• Linux Additions: made 3D pass-through work with recent versions of Mesa in the guest
• Linux Additions: Linux 3.16 fixes
• Mac OS X hosts: when scanning for host CD/DVD devices also consider BlueRay devices
• OS/2 Additions: fixed gengradd.dll library name
• Solaris Additions: fixed permissions of files and directories located on shared folders
• Windows host installer: fixed the need for rebooting Windows after installation or upgrade, extended logging for NetFlt/NetAdp (un)installation