TREE Network
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A tree network is a combination of the bus network and the star network. A tree network has a central line just like a bus network does but it connects a series of star networks. The advantages include an easily expansive network, a failed computer does not affect the rest of the network. However a failure in the central line will cause the network to crash.
Wi-FI
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It is any system where you can connect to a network or to a computer through wireless communications. They rely on using access points to communicate. It uses radio frequency technology so that the device can receive and send signals. WiFi hot spots are WiFi access locations. They can be free or paid. The practice of looking around for unsecured WiFi hot spots is called war driving