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What is Wi-Fi?

Wi-Fi is short for "wireless fidelity" and it uses radio waves to make a computer network without wires.  A Wi-Fi network at home or work is great because you can access your network from anywhere.  Be careful though—you need to carefully set up security for your wireless network to keep others from accessing it.  (See, How do I make my home or small business Wi-Fi network safe?)
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