Does printing in the four great inventions refer to simple woodcut printing or movable type printing?

Movable type printing in the four great inventions refers to the movable type printing invented by Bi Sheng in Qing Dynasty. Its method is: find some wooden pillars with the same size and height (originally made of clay, which is annoying) and carve different characters, then make an iron frame, wax the bottom, arrange the carved characters in the iron frame, and then burn the whole frame on the fire. Pay attention to the height of the block after the wax melts.

That's all I know, hehe.