Li-Fi means Light Fidelity. This technology is new to the world and it was developed by Harald Haas in the year 2011. It was mainly advanced for the wireless broadcast of data. Li-Fi is a wireless photosensitive networking technology that uses light emitting diodes (LED) for transmission of data. Though the technology was developed by German’s it is most popularly used by Chinese. In India Li-Fi is not popularly used as much as Wi-Fi. Wi-Fi is of main use for wide-ranging wireless coverage within buildings, whereas Li-Fi is perfect for high density wireless data coverage in limited area and it is useful for applications in radio interference issues. Li-Fi is developed to overcome the hurdles faced by Wi-Fi such as speed limit and limited area coverage. Li-Fi delivers better bandwidth, proficiency, connectivity and security than Wi-Fi and it has achieved high speeds larger than 1 Gbps. This paper emphases on Li- Fi, its applications, features and contrast with existing technologies like Wi-Fi.