BJD is the abbreviation of ball joint doll, and Chinese is "ball joint humanoid". It refers to all kinds of delicate movable figures (dolls) with spherical joints. Bjd originated in Europe and was once popular in Russia, and then it was introduced to Japan and South Korea.
Now it is mainly produced by East Asian countries and regions (such as China, Taiwan Province Province of China, Korean and Japanese).
Because the key parts are equipped with spherical joints, humanoid robots can make many postures close to real people. Gypsum, ceramics, wood and plastic can all be used to make human figures.