Is negative shadow the same as shadow description? Why?

No, the difference between the two lies in the difference in cause and definition.

1, the causes are different: negative shadow means that in photography, the color and brightness of the image on the negative are opposite to the actual shooting scene, that is, the original bright place will darken on the negative and the original dark place will brighten on the negative. Shadow refers to the shadow caused by objects blocking light.

2. Different definitions: "Shadow" usually refers to the shadow caused by objects blocking light, while "negative shadow" refers to the effect obtained by special processing of images on negative films.