They are not always called urban Legends. They can be called Urban Myths, Urban Tales or Urban Stories. And they are not necessarily from and 'Urban' origin.
It is a myth, hoax or misinformation.
An Urban Legend is somewhat like a myth. Urban happens to mean "city", and legend is "a story coming down from the past." One example of an Urban Legend is some...
What links them is that they're both legends. If you somehow mean how're they different, an urban legend is a legend that is popular in a certain area, maybe because it involves the character or...