Slender is a descriptive word, used to describe body weight or the style of clothing. Being slender usually means thins and straight lined (not many curves).
Slender man is a human like organism that has tentacles as arms, and sqeeses its victim to death. description white face,black body,and tentacles Not prooven to be real, but enough proof to be real....
This is a fictional character. Despite continued promotions in various blogs, websites, and videos, the Slender Man was rejected as factitious by Wikipedia.