Low-temperature superconductivity is a fundamental physical phenomenon observed in certain materials where electrical resistance vanishes and magnetic fields are expelled (Meissner effect) below a characteristic critical temperature, typically requiring cryogenic cooling. As an academic concept and research field, it investigates the underlying quantum mechanical mechanisms enabling this state, explores the discovery and characterization of novel superconducting materials, and studies the critical parameters governing their behavior, holding significant implications for fundamental physics and potential applications in energy, medical imaging, and high-field magnets.