Superfluidity is a unique state of matter that occurs at extremely low temperatures, where a liquid can flow without viscosity. This means it can move without losing energy, allowing it to flow through tiny openings and around obstacles effortlessly. The phenomenon is most commonly observed in liquid helium-4 when cooled below 2.17 Kelvin. In a superfluid state, the atoms behave collectively, forming a coherent wave-like structure. This behavior is a result of quantum mechanics, where particles can occupy the same space and state. Superfluidity has applications in various fields, including quantum computing and low-temperature physics.