Wi-Fi means Wireless Fidelity, this abbreviation is used just for publicity
Actually Wi-Fi represents a wireless standard IEEE 802.11. Wi-Fi enabled device will follow this standard to connect wireless router/wireless area network.
Wireless router:
It acts as a network switch to connect various devices to the network
It allows connection to the wide area network(WAN) internet
To connect the wireless devices in the network
To know more about Wi-Fi read:
http://www.howstuffworks.com/wireless-network1.htm
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