What's the difference between skeletons, zombies and undead?

Skeleton generally refers to a set of bones with no flesh and blood attached when people rot after death. People are generally extremely afraid of dead bodies, so are skeletons. All folk stories use skeletons instead of ghosts. The skeleton of a beautiful woman is called gorgeous bone, and the skull is often called skull. In ancient times, even in modern times, people sometimes made bones from the bones of their ancestors. In addition to general tools, they are mostly used in religious ceremonies to remember ancestors (such as human bones). People occasionally use the bones of enemies killed in battle to make props and boast of their courage (such as head drums made of the skulls of defeated enemies). Legend has it that the earliest zombie was Hiderigami, the daughter of Xuanyuan Huangdi. Because of the curse of Chiyou, she became a zombie. Originally zombies don't need to suck human blood. Because there is too little aura in heaven and earth, and man is the soul of all things, so we should suck blood. The word "zombie" comes from the Taoist book Mainland Thousand. Zombies mean: stiff limbs, not low head. Eyes are not oblique. The legs are not divided, and the body is not rotten. Zombies prevailed after the middle of Ming and Qing Dynasties. Most people recorded zombies in Qing Dynasty, and Yuan Mei's Woods Language and Ji Xiaolan's Notes on Yuewei Caotang were the first two, which can be said to be complete works of zombies. Undead refers to the souls of the dead, usually evil creatures in fantasy novel or games. Professions and roles in World of Warcraft, Warcraft and other games are named after this. There is also a poem of the same name. Especially after the normal life form of living things ends, there are signs of similar life activities or things continue to exist in other forms. The most representative undead are ordinary skeletons, zombies (non-zombies) and ghosts. Most undead are characterized by slow action and lack of self-awareness. Immortal creatures are considered to be a special life form caused by the lingering attachment of the living to this world and the deep grievances that cannot be resolved before death. Among them, ghosts without entities are special. Ghosts are considered as the materialization of pure spirits, and usually need to use weapons with magical power to cause substantial damage to each other. Therefore, in general, undead represent skeletons and zombies.