Dark energy is fundamentally different from traditional forms of energy and is responsible for the accelerated expansion of the universe. It does not behave like mass and does not interact with photons, making it invisible to current detection methods. Dark mass, which may include elusive particles like WIMPs, is characterized by its lack of interaction with ordinary matter. The distinction between dark mass and non-dark mass lies in their interactions with light and gravity. Overall, dark energy and dark mass represent complex concepts that challenge our understanding of physics.