Superfluidity is a state of matter characterized by zero viscosity, meaning it flows without any resistance. This unique property is typically observed in liquid helium when it is cooled below a certain critical temperature. Superfluidity also exhibits other remarkable behaviors such as the ability to flow through tiny openings without resistance and to exhibit quantized vortices. Research in superfluidity explores the fundamental physics behind these phenomena and investigates potential applications in areas such as quantum computing and precision instrumentation.