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: fixed keyboard shortcut handling regressions (Mac OS X hosts only; bugs #15937 and #15938)
• GUI: fixed keyboard handling regression for separate UI (Windows hosts only; bugs #15928)
• NAT: don't exceed the maximum number of "search" suffixes. Patch from bug #15948.
• NAT: fixed parsing of port-forwarding rules with a name which contains a slash (bug #16002)
• NAT Network: when the host has only loopback nameserver that cannot be mapped to the guests (e.g. dnsmasq running on 127.0.1.1), make DHCP supply NAT Network DNS proxy as nameserver.
• Bridged Network: prevent flooding syslog with packet allocation error messages (bug #15569)
• Audio: now using Audio Queues on Mac OS X hosts
• Audio: fixed recording with the PulseAudio backend (5.1 regression)
• Audio: various bugfixes
• Snapshots: fixed regression in 5.1.4 for deleting snapshots with several disks (bug #15831)
• Snapshots: crash fix and better error reporting when snapshot deletion failed
• Storage: some fixes for the NVMe emulation with Windows guests
• API: fixed initialization of SAS controllers (bug #15972)
• Build system: make it possible to build VBox on systems which default to Python 3
• Windows hosts: detect certain cases of REGDB_E_CLASSNOTREG errors and print a helpful error message
• Windows hosts: adapted to changes in Windows 10 build 14901 (bug #15944)
• Windows hosts: better support for processor groups on Windows 7 and later which is required on certain hosts with many CPUs
• Windows installer / Additions: added option to prevent creating of start menu items (bug #15922)
• Windows Additions / VGA: if the guest's power management turns a virtual screen off, blank the corresponding VM window rather than hide the window
• Windows Additions: fixed a generic bug which could lead to freezing shared folders (bug #15662)
• Linux hosts / guests: fix for kernels with CONFIG_CPUMASK_OFFSTACK set (bug #16020)
• Linux Additions: don't require all virtual consoles be in text mode. This should fix cases when the guest is booted with a graphical boot screen (bug #15683)
• Linux Additions: added depmod overrides for the vboxguest and vboxsf kernel modules to fix conflicts with modules shipped by certain Linux distributions
• X11 Additions: disable 3D on the guest if the host does not provide enough capabilities (bug #15860)