Light Fidelity, or Li-Fi, is a wireless communication technology that uses light to transmit data. Unlike traditional Wi-Fi, which relies on radio waves, Li-Fi utilizes visible light from LED bulbs to send information. This method can potentially offer faster data transfer speeds and improved security, as light cannot penetrate walls, making it less susceptible to unauthorized access. Li-Fi works by modulating the intensity of the light emitted by LEDs, creating a signal that can be detected by a photodetector. This technology is particularly useful in environments where radio frequency communication is limited or restricted, such as hospitals and airplanes.