  In this pedestrian approach I give my personal point of view on the various
problems posed by dark matter in the universe. After a brief historical
overview I discuss the various solutions stemming from high energy particle
physics, and the current status of experimental research on candidate particles
(WIMPS). In the absence of direct evidence, the theories can still be evaluated
by comparing their implications for the formation of galaxies, clusters and
superclusters of galaxies against astronomical observations. I conclude briefly
with the attempts to circumvent the dark matter problem by modifying the laws
of gravity.
