The Jaynes-Cummings Model describes the interaction between a two-level quantum system, such as an atom, and a single mode of a quantized electromagnetic field, like a photon in a cavity. This model is fundamental in quantum optics and helps explain phenomena like the emission and absorption of light by atoms. In this model, the atom can exist in two states, often referred to as the ground state and the excited state. The coupling between the atom and the electromagnetic field leads to interesting effects, such as Rabi oscillations, where the probability of finding the atom in either state oscillates over time due to their interaction.