Running script is a font between cursive script and regular script. The early running script was between cursive script and official script, and now the common running script is between cursive script and regular script. Whether it's official script or regular script, it's a bit time-consuming to write one stroke at a time. Therefore, when people write something that is not very important, they often write casually and hastily, which is faster, but at the same time, they should keep the form of regular characters. This is a running script. Since the Six Dynasties, it has been the main handwritten font.
The characteristic of running script is to use Lian Bi appropriately and save strokes on the premise of keeping the outline of regular script. Running script has no strict writing rules. Running script is called when there are many regular script elements and few cursive script elements, while running script is called when there are few regular script elements and many cursive script elements.