A wi-fi connection is a wireless connection. Imagine a regular modem, which is connected by a wire to the phone point at one end, and the PC at the other. Wi-fi is when this setup is wireless, the router is still wired to the phone point, but it gives off a signal to which other devices can connect to. A PC can connect to this using a receiving device, and a Nintendo DS can connect to it too. That is an example of a wi-fi internet connection.
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