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It is a new technique to transmit secure data using light energy, for sending and receiving the data using light, LED (Light Emitting Diode) from one node to another node. In the decade research, the sender's node light will blink continuously blink when the data is transferred to the receiver node. this might look awkward like a remote control. And moreover, there are drawbacks in the wireless network which used as Wi-Fi for node and there might be speed difference in the nodes when using the network like some node get the high speed of data transfer and remaining nodes suffer at very low speed. This problem will overcome in the Li-Fi approach since the light radiation received on the receiver side is similar and the receiver node will able to transfer data at high speed even the device is far away from the sender. The data transfer rate will be 9600 bits per second, it means the speed is sufficient to transfer without lagging. Li-Fi System is mostly applicable for the mobile nodes and IoT devices with embedded software, color sensor, and a microcontroller. The light source from the mobile node communicates with the color sensor on the receiver node which further covert the light data into digital information. These applications are mainly used in consumer product IoT devices.