Supernovae are among the strongest explosions in the universe and play an
important role in many aspects of astronomy: from the production of heavy
elements to their use as standard candles to probe the early universe.  But
they also probe many aspects of physics: from the behavior of matter at high
densities to the effects of high gravitational fields.  I will review the
basic mechanism behind core-collapse supernovae and highlight the latest
advances in our understanding of these cosmic explosions.  In particular, I
will highlight our recent 3-dimensional results and emphasize the evidence
and the explanations for asymmetries in these explosions.