[PurpleRamen]

Dark matter is the hole in the formulas, the dark spot were no lights shines yet. We don't really know whether it exists or not, we only know that our models of the universe have this strange corner were things don't work as they should work. And because all the others corners work so well, we assume that there must be something else.

Its called dark matter because the strange corner is in the models regarding matter. Thre is also dark energy, a strange corner in our models of energy.