Gravitational Microlensing and Dark Matter

Kim Griest

We discuss the status of Massive Compact Halo Objects (Machos) as dark matter. We review our the original results towards the LMC, as well as more recent results and controversies. We also discuss other applications of the gravitational microlensing technique, such as taking inventories of dark objects in the galactic bulge and the recent discovery of extra-solar planets.