According to the Information Architecture Institute, information architecture (IA) refers to the structural design of shared information environments" focused on how to organize and label content, but also on the search and navigation systems to support usability and findability.
The information architecture that we know of today began around the 70s, long before the emergence of web and mobile applications, or the popularization of UX design. Like usability and accessibility, IA goes beyond the digital world. From the gondolas of a supermarket to a newsstand, ...