Lewis Structures are diagrams that represent the bonding between atoms in a molecule and the lone pairs of electrons that may exist. They use dots to show valence electrons and lines to indicate bonds between atoms. Each line represents a pair of shared electrons, while unshared electrons are depicted as pairs of dots. These structures help visualize the arrangement of atoms and the distribution of electrons, making it easier to understand molecular geometry and reactivity. Gilbert N. Lewis, who developed this concept in 1916, aimed to simplify the understanding of chemical bonding and molecular structure.