Final answer:
True, sigma bonds are formed by the end-to-end or head-on overlap of orbitals, while pi bonds result from side-by-side overlapping of p orbitals.
Step-by-step explanation:
The statement is true. Sigma bonds (σ bonds) are formed through the head-on overlapping of orbitals such as the overlap of two s orbitals, an s orbital and a p orbital, or the end-to-end overlap of two p orbitals. This creates a bonding area directly between the two nuclei involved.
On the other hand, pi bonds (π bonds) are formed when p orbitals overlap side-by-side, resulting in the electron density being concentrated above and below the plane of the nuclei. This is the case in molecules with double or triple bonds, where pi bonds supplement the sigma bond(s) holding the atoms together.