Digital signage is a broad term encompassing a variety of different applications and technologies. In a general sense, digital signage refers to electronically controlled signs that can be updated without the cost and expense of changing the physical sign itself. Thus, changes can be made quickly and cost effectively, and targeted messages can be distributed to hundreds or thousands of displays at once.

Digital signage displays can take the form of scrolling message boards, plasma monitors, and large projection screens, as well as other emerging display types like organic LED. In addition, the creative use of existing display technologies has led to innovations like polarized projection film, which allows high-contrast digital signage images to be projected directly onto store windows.

Because digital signs are typically placed in high-traffic areas, it's important to choose a robust and stable sign software package to ensure that the right message appears at the right time.