Astronomical and cosmological observations indicate that most matter in the
universe is non-luminous and
non-baryonic. This ``dark matter'' consists of particles of unknown type and requires physics beyond the
standard model of particle physics. I review the motivation for and the basic physics of several dark matter
candidates, including Wimps (with the lightest supersymmetric particle as prime example), axions, and
superheavy dark matter. After a brief overview of experimental techniques and prospects for their detection,
I'll concentrate on indirect detection. In particular, I'll discuss recent experimental results from Pamela,
comparing particle physics and astrophysical solutions to their data.