in the API a component is a connected set of atoms and the bonds connecting them. These can be copies of the fundamental molecular structure as is the case with PENCEN03 where there are two copies of pentane, or different structures as in the case of ABEBUF. These may be solvent molecules, coformer molecules, cocrystals or salts.
When we pack the unit cell, we can get copies of all these components in a single molecule. So in PENCEN03 you will get 10 copies of the pentane molecule. When we pack ABEBUF, we get eight copies of each of the two structures of the crystal.
I hope this is clear. If not, I'll try to expand on it, or ask a crystallographer here to make things clearer.
I really don't mind whether you open another topic or keep it here, but since it naturally follows on from your earlier question, perhaps here is best.