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: improved support for certain Intel Atom CPUs (bug #14773)
• VMM: system register emulation fix (5.0 regression; bug #14515)
• GUI: fixed immediate screenshot issue (bug #14108)
• GUI: fixed another 3D overlay window reparenting issue when the VM is switched to fullscreen mode on X11 hosts
• GUI: fixed help index (bug #14722)
• GUI: fixed state synchronization issue in the VM manager window when VM was paused from its runtime window
• Audio: fixed suspending/resuming audio streams on VM pause/unpause (bug #14784)
• Audio: properly reset AC97 audio streams, otherwise there is silence until a non-48 kHz stream is played
• Audio: fixed a small emulation quirk of the AD1980 codec of the HDA device to make recent linux guests work (bug #14653)
• USB: serveral fixes for the xHCI controller
• USB: fixed a crash under certain conditions on hosts with Linux kernels older than version 3.3
• USB: better identification of certain USB devices
• NAT: support TCP in DNS proxy (bug #14736)
• NAT Network: fixed sporadic crashes on Windows hosts (bug #13899)
• API: when creating differencing images (e.g. as part of a snapshot or cloning a VM) use the same disk image variant as the parent image if possible, which means that e.g. a diff image for a VMDK image split into 2 GB files will also be split (bug #14764)
• API: event queue handling fixes preventing loss of certain events at runtime (e.g. new webcam attached), particularly important on Mac OS X hosts
• Webcam: passthrough fix for certain devices (Windows hosts only)
• VBoxManage: don't crash on snapshot restorecurrent / edit if the VM has no snapshots
• VBoxManage: don't crash on controlvm addencpassword (bug #14729)
• Mac OS X hosts: use the correct kernel on certain hosts
• Windows hosts: fixed VRDP external authentication
• Windows hosts: allow to use a shared folder path with extended-length path prefix (5.0 regression; bug #14651)
• Windows hosts: fix a crash in the netfilter host driver under certain conditions (bug #14799)
• Windows host installer: documented and fixed public properties which can be used to control the installation to some extent
• Windows host installer: fixed not starting the actual installation when showing the version information or help dialogs
• X11 Additions: added basic support for X.Org Server 1.18 (3D requires additional fixes)