To oversimplify manga vs. anime, anime are TV shows or movies, while manga are comic books or graphic novels. The two media share a unique visual style, and many manga serve as the basis for anime. Still, most manga are never made into anime series, and not anime series are based on manga.
Anime and manga are two different mediums that share a unique visual style. Both media are very popular in their own right, and many manga are the basis for anime.