Our best description [so far] of the fundamental machinery of the Universe.[?]
Fermions[?]
Bosons[?]
We know the standard model isn't complete; there are lots of unresolved mysteries.
*It doesn't really answer why anything exists but it does describe what exists and how it behaves.
If we peel away the layers of complexity from humans to cells to molecules to atoms to subatomic particles we reach the standard model of particle physics.