Dark Matter is often mentioned and used as a theme in TV shows and movies, but just what is dark matter? To answered that question, even the scientists are not 100 percent sure it exist. Dark matter is an indivisible matter, scientists believed is at work to keep the universe interact by providing extra mass and gravity. Due to its characteristics of noninteraction to electromagnetic force, dark matter is extremely hard to spot, however, scientists was able to infer its existence from the gravitational effects it seems to have on normal, visible matter. Ready for a shocking fact, the matter we know and learned from school that made up the stars and galaxies, only make up for about 5 percent of the content of the universe, while dark matter