  Though there is strong evidence that dark matter is a major component of the
universe, most aspects of dark matter are completely mysterious. We do not know
what dark matter is, and we do not know how it is distributed in our galaxy. To
resolve these and related questions, we will need information both from
particle physics and from astrophysics. In this article, we will describe a
path toward the solution of the problems of dark matter, and we will highlight
the important role that the ILC has to play in this study.
