Sigma Bond:A sigma bond is a type of covalent bond formed by the direct overlap of atomic orbitals, resulting in a single shared electron pair.
Pi Bond: A pi bond is a type of covalent bond formed by the side-by-side overlap of atomic orbitals, sharing electron pairs above and below the plane of the nuclei.
Lewis Structure:A Lewis structure is a diagram that represents the bonding between atoms in a molecule as well as any lone pairs of electrons.