When atomic orbitals interfere constructively with each other, they increase the chances of finding electrons between nuclei, forming what we call a bond.
The hexagon-thingy in the middle is the LCAO (Linear Combination of Atomic Orbitals):
Concept: Sigma bond vs. pi bond, which is stronger?4m
Hey! Turn that frown upside-down. I know this section blows. The rest of this chapter should be cake compared to this.