how to add virtualbox guest additions ubuntu 16.04.3

With guest addition installed, the virtual machine adjusts to match the resolution of the host system. Enhanced Video Performance: By default, virtual machines come with a display that is much smaller and does not provide a resolution that matches that of the host system.Shared Folders: The guest additions also enable you to make folders that can be accessed by the virtual machine as network shares.Mouse Pointer Integration: Recall how you usually have to press a combination of keys to release the mouse pointer from the virtual machine? With Virtualbox guest additions, that becomes a thing of the past as you can comfortably move your mouse pointer to and from the guest and host OS.Drag and Drop: Additionally, Virtualbox guest additions enable you to drag and drop files between the host and guest operating systems.Shared Clipboard: You can seamlessly copy and paste content between the host and guest operating systems.VirtualBox guest additions provide extended features such as: VirtualBox also includes VirtualBox guest additions which are additional applications and drivers that improve the performance and usability of a virtual machine.

As you might know, VirtualBox is an open-source hypervisor that allows users to create virtual machines and test-run different operating systems.

How to add virtualbox guest additions ubuntu 16.04.3