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What is wi-fi?

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Wi-fi is wireless internet access in a specific area, usually put out by a router.

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Wireless Internet Connection, You might be running on it now.

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Short for "Wireless Fidelity." Wi-Fi refers to wireless networking technology.

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It's just a wireless connection -

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http://4.bp.blogspot.com/_40Nn-O6iy9s/TSi-fO6o8mI/AAAAAAAAAB8/nAalIJkW5_Q/s1600/HomepageImage1.jpeg

All it is, is a wireless connection between two things. When you set your home network up you use a "router" to connect all of the different computers together. It used to be that you could only use wires, but now if your router has "wifi" then it is able to broadcast a signal to even more computers (or cell phones, or anything with "wifi capability") to connect them as well. Now all of the computers can communicate. If you have a wireless connection to your router, all of your computers that are connected to your router can access the internet.

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Wireless free internet

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It's not free. Someone is paying for it. If it's a wifi network in your home, you're still paying for the internet. Your router just happens to also be able to broadcast wirelessly.

Now, if you're piggybacking off of someone else's wifi network, then I suppose it is free to you...
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It's a short range wireless LAN, a local area network to connect computers, printers and other appliances with each other. It can also be used to provide a internet connectivity.

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