According to MOT, two atomic orbitals overlap resulting in the formation  of molecular orbitals.  Number of atomic orbitals overlapping together is equal to the molecular orbital formed.  The two atomic orbital thus formed by LCAO (linear combination of atomic orbital) in the same phase or in the different phase are   known as bonding and antibonding  molecular orbitals respectively.  The energy of bonding molecular orbital is lower than that of the pure atomic orbital by an amount .  This known as the stabilization  energy.  The energy of antibonding molecular orbital is increased  by (destabilization energy).