Li-Fi technology is point-to-point light based communication  system running wireless communications travelling at very high speeds. Instead of radio wave it use light waves to deliver data. Li-Fi or Light Fidelity uses common household LED (light emitting diodes) lightbulbs to enable data transfer, boasting speeds of up to 224 gigabits per second. The term was named by Professor Harald Haas during a TED Talk in 2011 introducing the idea of “Wireless data from every light”. and is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or cellular networks).Li-Fi will not replace 4G, LTE and Wi-Fi, but will work alongside them. Li-Fi Technology Over Wi-Fi

Wi-Fi Wireless Fidelity

Wi-Fi or WiFi is a technology for wireless local area networking with devices based on the IEEE 802.11 standards. Wi-Fi is a trademark of the Wi-Fi Alliance. The first version of the 802.11 protocol was released in 1997, and provided up to 2 Mbit/s link speeds. This was updated in 1999 with 802.11b to permit 11 Mbit/s link speeds, and this proved to be popular.

Li-Fi Over Wi-Fi

Like Wi-Fi, Li-Fi is wireless and uses similar 802.11 protocols; but it uses visible light communication (instead of radio frequency waves), which has much wider bandwidth. Both Wi-Fi and Li-Fi transmit data over the electromagnetic spectrum, but whereas Wi-Fi utilizes radio waves, Li-Fi uses visible light. Li-Fi is much faster then Wi-Fi. Li-Fi is expected to be ten times cheaper than Wi-Fi. Short range, low reliability and high installation costs are the potential downsides. The light waves cannot penetrate walls which makes a much Li-Fi shorter range.

Here is image from wikipedia

In April 2014, the Russian company Stins Coman announced the development of a Li-Fi wireless local network called BeamCaster.

Li-Fi technology will in future enable faster, more reliable internet connections, even when the demand for data usage has outgrown the available supply from existing technologies such as 4G, LTE and Wi-Fi. It will not replace these technologies, but will work seamlessly alongside them.

Keys point of Li-Fi

• A dual use for LED lighting For lightning and communication
• Super High Speed connections
• energy-efficiency by 100 times energy reduction
• The signal cannot be hacked from a remote location as the light cannot penetrate through walls.
• Underwater Application as light wave could travel through water

Li-Fi technology is being developed light receivers including solar cells, efficient computational algorithms and networking capabilities that can be deployed in a wide range of communication scenarios and in a variety of device platforms. Lets wait for all these being used. Li-Fi Technology Over Wi-Fi Have good days.