The final stages of the life of a massive star occur in a violent explosion that astrophysicists refer to as a core-collapse supernovae. Unfortunately, there is still much we don't know about these explosions. For over half a century scientists have been attempting to use models to understand what causes the explosion. And it's been over a quarter of a century since we've been fortunate enough to get a glimpse of what goes on in the interior of a core-collapse supernovae. In this talk I will explain what we now know, as well as what we don't know, about these incredible events.