One interesting tidbit about this is that neutrinos
can be an important agent of this explosion.
Now neutrinos hardly interact with matter at all, but they do interact.
Now if you put a lot of particles, protons and neutrons in their way,
such as you have in massive star, then there is a reasonable probability for
these neutrinos to actually Interacting with that material and
see where a neutrino pushing the star and all that.
At least that's the theoretical model.
So the collapse of the core releases binding energy that's created.
That creates a shock that goes outward.
That shock is what explodes the star.
And that's again indicated here.
So the energy of the supernova comes from the release of the binding
energy that suddenly you're packing a substantial fraction of star's mass.
At least two stellar masses, more if possible,
into a tiny remnant that's kilometers in size.
And that binding edge is then converted into kinetic energy and
luminosity in both electromagnetic and neutrinos.