From the official documentation: > Functors: uniform action over a parameterized type, generalizing the map function on lists. > Is it really more complicated

From the official documentation: > Functors: uniform action over a parameterized type, generalizing the map function on lists. > Is it really more complicated than "apply a function to every object in a list"? It is defined for more data structures then just a lists. Other than that, not at all. As far as I can tell, the only reason Haskell has both map and fmap is because "map" came first. When applied to a list, fmap and map are identical.