Digital signage is the term for the displays you see in coffee shops, gyms, hospitals, schools, banks, and pretty much any other business or organization with a physical presence. Digital signage has a wide variety of uses such as providing information, generating sales, recognizing donors, etc. It used to be limited to large businesses because of the high costs of installing, managing, and creating content; but in the past 5 years or so, the industry has seen an influx of low-cost media players (the computers that power the displays) and content management systems (the software that puts the content on the displays).
You can now purchase a Raspberry Pi 2, use a free content management system, and an existing TV; and have a digital signage system for as little as $45. With the barrier to entry being continually lowered, it