VirtualBox是一款免费且开源的虚拟化软件，允许用户在他们的计算机上创建和运行虚拟机。使用VirtualBox，用户可以在他们的计算机上同时安装和运行多个操作系统，而无需创建单独的分区或购买额外的硬件。

VirtualBox的主要优点之一是易于使用。即使是对虚拟化技术几乎没有经验的人，它也很容易安装和设置。VirtualBox还提供了广泛的自定义选项，包括调整分配给每个虚拟机的RAM、CPU核心和硬盘空间的能力。

VirtualBox的另一个重要特点是其与多种操作系统的兼容性。用户可以在他们的虚拟机上安装和运行Windows、Linux、macOS及许多其他操作系统。这使得它成为一个对开发人员、软件测试人员以及任何需要在单台计算机上运行多个操作系统的人来说非常优秀的工具。

VirtualBox 还提供了一系列高级功能，例如对 USB 设备、共享文件夹和网络适配器的支持。这些功能使得运行需要硬件或网络资源的软件成为可能，例如虚拟路由器、防火墙和服务器。

VirtualBox 是任何需要在一台计算机上运行多个操作系统的人的绝佳选择。其易用性、广泛的自定义选项以及与许多不同操作系统的兼容性，使其成为开发人员、IT 专业人员和家庭用户的多功能而强大的工具。

关键功能：

• 跨平台兼容性。
• 直观的图形用户界面。
• 支持各种操作系统。
• 与主机操作系统的无缝集成。
• 快照和克隆。
• 网络功能。
• 虚拟设备支持。
• 扩展包用于增加功能。

• GUI: the update check now uses the HTTP system proxy settings by default
• GUI: About dialog improvements. Copyable version text, do not close dialog on mouse-clicks and focus losing, explicit close button at the bottom of dialog and disabled close button fix on OS X.
• GUI: fixed bug when re-assigning shortcuts
• GUI: fixed default focus button in message-box dialogs
• GUI: fixed settings dialog which is opened if the network settings need to be changed at VM startup
• GUI: fixed crash during VM start if an early error message needs to be shown, for example Linux kernel modules not present
• Bridged Networking: fixed handling of guest DHCP requests without UDP checksum when bridging to a wireless interface
• Audio: latency fixes
• Guest Control: correctly set USERNAME and USERPROFILE environment variables
• Guest Control: several fixes
• API: properly restore NAT port forwarding rules when reverting to a snapshot
• Parallel ports: Several fixes allowing to enable two parallel ports for a VM
• VBoxManage: fixed wrong output of debugvm show command
• VBoxManage: fixed hang when specifying logging groups with debugvm log starting with h, for example hex
• Windows hosts: renamed VBoxStartup.log to VBoxHardening.log and provide this log file in the GUI log viewer
• Windows hosts: fixed a small memory leak in the Windows host interface driver (VBoxNetAdp) which caused a BSOD if the driver verifier is enabled
• Windows hosts: fixed a failure to start VMs on hosts where dsound.dll is not available
• Windows hosts: another fix for VERR_LDR_MISMATCH_NATIVE errors
• Windows hosts: fixed host-to-guest communication with bridged networking
• Windows hosts: fixed broken data receiving from the serial device with the named pipe backend if Kaspersky AV is installed
• Linux hosts: Linux 4.3 compile fixes
• Linux hosts: installer fix for certain systems
• Linux hosts / guests: native systemd support for the host/guest installer scripts. The scripts for re-compiling the kernel modules are now located at /sbin/rcvboxdrv (host) and /sbin/rcvboxadd (Guest Additions)
• Mac OS X hosts: GUI-related fixes for El Capitan
• Mac OS X hosts: fixed a problem with capturing USB devices under El Capitan
• Mac OS X hosts: allow colon character on shared folders
• Linux Additions: properly set the VBoxService process ID in the PID file
• Linux Additions: Guest Control fixes
• Windows Additions: fixed shutting down VBoxTray when running with older VirtualBox host versions
• Windows Additions: fixed video playback with VLC and Windows Media Player when the WDDM driver is used and 3D is not used
• Windows Additions: prevent a possible VLC crash when the WDDM driver is used and 3D is enabled by implementing YV12 surfaces