I want to show my exact desktop, laptop, phone or tablet screen (or an application window of the screen) on displays in other locations.
Screen mirroring duplicates your exact display onto another screen. Wired screen mirroring is still in use — HDMI and the almost-extinct VGA cable — but wireless screen mirroring has been around for years. To mirror your screen, you must have a display such as a TV or monitor that can receive content wirelessly, using either built-in technology or an adapter.
AirPlay is one of the older technologies supporting screen mirroring, but works only with Apple devices; Miracast, now built into many smart TVs, debuted soon after, but it has steadily decreased in use. In the workplace, screen mirroring is popularly used in meetings and features its own group of products tailored for its use, including BiJie Box.