A Lewis Structure is a diagram that represents the bonding between atoms in a molecule and the lone pairs of electrons that may exist. It uses dots to show valence electrons and lines to indicate covalent bonds between atoms. This visual representation helps in understanding the arrangement of electrons and the overall structure of the molecule. In a Lewis Structure, each atom is represented by its chemical symbol, while dots around the symbol represent the valence electrons. The structure is named after Gilbert N. Lewis, an American physical chemist who developed this method in the early 20th century to simplify the study of molecular structures.