The electronic structure of graphene is manifested by two identical hexagonal (hxl) sublattices, whose superposition yields a honeycomb (hcb) lattice. The unit cell contains two equivalent sites with inverted connectivities. The Dirac cone, the most characteristic feature of the graphene band structure, is a direct consequence of the hcb lattice. A tight-binding (TB) model describes this electronic structure correctly, and is, thus, also suitable for describing the superlattice interactions. The wide band gap insulator hBN also has a hcb lattice. However, it is created by the superposition of two inequivalent hxl sublattices, one formed by the boron and the other by the nitrogen atoms. As B and N strongly differ in their chemical potentials, also their TB on-site elements do and, thus, cause a band gap opening.