What does "digital signage" refer to in multimedia applications?

Digital signage refers specifically to electronic displays that are used to present information, advertisements, and other forms of multimedia content. This technology often employs LCD, LED, or projection screens to deliver dynamic content, making it a versatile tool for engaging audiences in various environments such as retail locations, transportation hubs, and corporate settings. The use of electronic displays allows for real-time updates and the ability to change the content easily, which enhances communication and marketing effectiveness compared to traditional static displays.

In contrast, the other options focus on mediums that do not embody the characteristics of digital signage. Printed advertisements in books and static displays in retail shops lack the interactive and dynamic features of digital technology, while personalized user notifications are primarily associated with direct communication or alerts rather than broad display applications intended for a general audience. Thus, the essence of digital signage lies in its use of electronic formats to convey information and advertisements effectively.