MouseLight has borrowed the concept from theatres and applied it your computer where the actor is the mouse cursor and the stage is the desktop screen.
Also see: More useful tools for presenters
When you are doing a PowerPoint presentation or a software demonstration and want the audience to focus on some specific area of the screen, MouseLight puts a circular spotlight around your cursor and highlights that area allowing your audience to follow you - the rest of the screen outside the spotlight circle is dimmed automatically.
There's another advantage of MouseLight - If you are work on a large screen or a dual monitor, it's so common that you keep losing track of the mouse pointer. With MouseLight, just press the hotkey and you'll immediately know where the cursor is placed on the screen. No guesswork required.
MouseLight is available for Windows only, Mac users have a similar application called Mouseposé.
Related: Do Live Presentations without a Projector