Back in the 90s, stiff and inflexible software development processes were not satisfactory – they needed to be more lightweight and flexible. And so, new processes like Scrum were innovated. Despite that, it wasn’t until 2001 that there was a name to bring all the similar development currents together. A few leading minds sat together and specified values and principles with which one could develop software more efficiently, and named this sort of development agile. So originally, the concept of being agile came from software development. From there, over the course of time, the description agile project management was developed, because not just software projects can be controlled and planned agilely.
This value puts everyone involved in the project in the foreground. So that everyone can reach their full potential, the scope should not be limited through processes, as is often the case in classical project management. People and their constant communication advance the project and not the processes or tools that are used.