Quantum energy refers to the energy levels associated with quantum mechanics, the branch of physics that studies the behavior of matter and light at very small scales, such as atoms and subatomic particles. In this context, energy exists in discrete units called quanta, which means it can only take on specific values rather than a continuous range. This concept is fundamental to understanding phenomena like photons, which are particles of light that carry energy in quantized amounts. The principles of quantum energy have led to various technological advancements, including quantum computing and quantum cryptography. These technologies leverage the unique properties of quantum states to perform calculations and secure communications in ways that classical systems cannot. Understanding quantum energy is essential for exploring the potential of these emerging fields and their applications in modern science and technology.