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WiFi is the nickname for Wireless Fidelity - high speed internet and network connection without the use of wires, cables and other stuff you can trip over.
Wi-Fi is the bridge that allows electronic devices to connect to the networks. Wi-Fi is local area wireless computer networking technology that enables you to connect your electronic gadget that has the Wi-Fi facility to connect to the network. The synonym of Wi-Fi is WLAN or wireless local area network.