It is a way to understand and visualize how electrons exist in a molecule.
It predicts where an electron is most likely to exist in an atom or a molecule.
It also predicts the shape of the atomic orbitals pre-bonding and molecular orbitals post-bonding.
the basis of the molecular orbital theory is the molecular orbitals produced from quantum mechanics.
Molecular orbital theory leads to a more comprehensive understanding of how the atoms bond to each other, especially with the bond strength and bond order.