Unity provides a complete, simple, touch-ready environment that integrates your applications and your workflow.
Unity is designed for mouse, touchpad, and keyboard use. It includes a new panel and application launcher that makes it fast and easy to access preferred applications, such as the browser, while removing screen elements that are rarely used.
Unity has a vertical task management panel on the left-hand side and a menu panel at the top of the screen. Using a sidebar for task management conserves vertical screen space, which is much more valuable on today’s widescreen monitors. The task panel displays icons for commonly-used applications and programs that are currently running. Clicking on an icon will give the target application focus if it is already running or launch it if it is not already running. If you click the icon of an application that already has focus, Unity will activate an Expose-style view of all the open windows associated with that application.
You can use the following command from your terminal to check the unity version you are running
There are other ways to check the unity version for example you can search the unity package using the following command
apt-cache policy unity