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, ultraviolet, and infrared light to send information. This method can achieve high data transfer speeds and is particularly useful in environments where radio frequency communication is limited or interfered with. The technology works by modulating the intensity of light emitted from LED bulbs, which can be detected by a photodetector. As the light flickers at a speed imperceptible to the human eye, it encodes data that can be decoded by devices, providing a fast and secure internet connection.