The document discusses digital and smart signage. It describes the typical architecture of a digital signage system, which includes screens, clients, and a controller that communicates via websockets. Smart signage applications mentioned include wayfinding, displaying purchase and favorites information, accounting, product information, queue management, order pickup, and integrating with a voice assistant. The smart signage can also access a store database to show recently arrived, best-selling, or recommended products based on emotional recognition of the customer.