Li-Fi (Light Fidelity) and Wi-Fi (Wireless Fidelity) are both technologies used to transmit information wirelessly, but they work on completely different principles. These are some main advantages Li-Fi has over Wi-Fi :

1. Speed: Li-Fi can give a blazing transmission of up to 224 Gbps in data transfer—miles better than Wi-Fi, which can at most run only up to 100 Mbps and, in most cases, just a few Gbps. It is so because visible light works at a higher frequency than radio waves, used under the wing of Wi-Fi.

2. Bandwidth:The bandwidth for Li-Fi is enormous with the visible light spectrum being 10,000 times larger than the radio spectrum, such that this is 10,000 times larger. Implausibly, this tries to reduce the congestion problems other than the problems experienced with Wi-Fi in relatively high-density environments.

3. Security: On the other hand, since the Li-Fi signals are within the illumination area, they are further secure from passing through the walls where there might be unauthorized access. This removes the risk of eavesdropping since the Wi-Fi signals pass through walls.

4. Interference: With electromagnetic interference from devices like Wi-Fi, which might not be interfered with by microwaves or cordless phones, hence Li-Fi fits for places vulnerable to such interference like hospitals and airplanes.

5. Availability: Li-Fi can work in environments where radio frequency communication is not ideal or allowed. As long as there is light, Li-Fi can provide connectivity, even in underwater environments or other places where Wi-Fi is not feasible.

Overall, for Li-Fi, the properties of speed, bandwidth, security, reduced interference, and versatility make an interesting alternative or complement with Wi-Fi in all kinds of applications.