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。

• VMM: fixed an issue with Windows 10 guest kernel debugging over the network for Hyper-V paravirtualized VMs
• VMM: fixed a bug which prevented reading the saved state of the 'PATM' unit from VirtualBox 4.3.x (bug #14512)
• GUI: changed default OS type for Windows from Windows XP to Windows 7
• GUI: added another pre-defined guest screen resolution (bug #14384)
• GUI: fixed update check which was broken due to changing the location of the root certificates (bug #13096)
• GUI: fixed issues with synchronization of Caps lock / Num lock / Scroll lock on Windows hosts (bug #14302)
• GUI: don't crash during VM shutdown if 2D video acceleration and 3D support are enabled (Mac OS X hosts only)
• GUI: several seamless fixes for certain X11 window managers, also when used in multi-screen setups
• GUI: Log window size, position and cursor-position fixes
• Audio: fixed playing leftover/deprecated audio samples
• Audio: fixed playing audio after suspending the host (5.0 regression; Linux hosts using the ALSA backend)
• Audio: fixed playing short audio samples which were chopped off formerly
• Audio: fixed distortions on OS X when the sample rate of the guest stream and host device don't match
• Storage: fixed raw disk access and flat VMDK image access which would be always opened readonly (5.0.2 regression; bugs #14425, #14461)
• Storage: fixed initial encryption of VDI images after they were compacted (bug #14496)
• VGA: fix for certain graphics modes (bug #14516)
• NAT: don't freeze while the VM is paused if the network attachment mode is changed from/to NAT with activated port forwarding
• OVF: fixed duplicate USB controller entries in exported OVA/OVF (bug #14462)
• Shared Folders: fixed a path separator issue (bug #14434)
• Drag and drop: fixed crashes on OS X hosts when doing host-to-guest transfers
• VBoxManage: another attempt to not deny changing the network adapter type at VM runtime (5.0 regression; bug #14308)
• VBoxManage: fixed broken guestcontrol list command (5.0 regression)
• VBoxManage: fixed broken Guest Control stdout/stderr output (5.0 regression)
• Mac OS X hosts: fixed remaining problems with activated SMAP (Broadwell and later; bug #14412)
• Mac OS X hosts: fixed broken 3D support (5.0.2 regression; bug #14476)
• Linux hosts: Linux 4.2 fix
• Linux hosts: don't crash on older Linux distributions if the DBus service isn't running (bug #14543)
• Windows hosts: fixed the VERR_LDR_MISMATCH_NATIVE error message (bug #14420)
• Windows hosts: fix for Windows 10 build 10525 and later (bug #14502)
• Windows hosts: fixed network adapter enumeration on Windows 10 (bug #14437)
• Windows hosts: prevent intermittent host network disconnects during VM start/shutdown with bridged networking (bug #14500)
• Windows Additions: fixed the call to the memory allocation function (bug #14415)
• Linux Additions: be more forgiving if the compilation of the vboxvideo module fails (bug #14547)
• X11 Additions: fixed a number of small issues with dynamic resizing and full-screen and seamless modes.