A vampire is a mythical or folkloric creature said to subsist on human or animal blood often having magical powers and the ability to transform. Usually the vampire is the corpse of a dead person, reanimated or made undead by one means or another. Some cultures have myths of non-human vampires, such as demons or animals like bats, dogs, and spiders. Vampires are often described as having a wide variety of additional powers and character traits, extremely variable in different traditions, and are a frequent subject of folklore, cinema, and contemporary fiction.
Vampirism is the practice of drinking blood. In folklore and popular culture the term generally refers to a belief that one can gain supernatural powers by drinking human blood. The historical practice of vampirism can generally be considered a more specific and less commonly-occurring form of cannibalism. The consumption of another’s blood has been used as a tactic of psychological warfare intended to terrorize the enemy, and it can be used to reflect various spiritual beliefs.
In zoology the term vampirism is used to refer to leeches, mosquitos, mistletoe, vampire bats, and other organisms that prey upon the bodily fluids of other creatures. This term also applies to fictional animals of the same nature, including the chupacabra. (via Wikipedia)
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