According to Einstein's equation, \(E=mc^2\), there is a direct relationship between energy and mass. This equation posits that energy (E) is equal to mass (m) multiplied by the speed of light (c) squared. This implies that mass can be converted into energy and vice versa, indicating that they are two forms of the same concept. This principle underlies various phenomena in physics, including nuclear reactions and the energy produced in stars, emphasizing the profound connection between mass and energy in the universe.