Lewis Theory is a concept in chemistry that explains how atoms bond together to form molecules. It focuses on the idea that atoms achieve stability by sharing or transferring electrons. This theory uses Lewis structures, which are diagrams that represent the arrangement of electrons around atoms, to visualize these interactions. In Lewis Theory, there are two main types of bonds: covalent bonds, where atoms share electrons, and ionic bonds, where electrons are transferred from one atom to another. This framework helps chemists understand the behavior of different substances and predict how they will react in various chemical processes.