A werewolf is a person who can take on the form of a wolf. Usually they run on all fours just like the animal they’re mimicking. Then there are the Wolfmen who have the attributes of wolves but walk on two legs like a human.
The name werewolf come from Old English werwulf, or man-wolf. The word lycanthrope means wolf-person. We get it from ancient Greece. King Lycaon was the ruler of a Greek City State way back when the gods were less well behaved. Lycaon invited Zeus to dinner one day with the intentions of testing him to see if he was really all knowing.
Lycaon killed his son Nyctimus, and then had him cooked and served for dinner. Those old Greeks had some issues.
Just a few werewolf stories that might make you believe these things are real.