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Wi-Fi is a system for sending data over computer networks that uses radio waves. Modern laptops and tablets usually have a built-in internal Wi-Fi wireless card. But certain desktop computers may require a Wi·Fi USB adapter or a Wi·Fi network card

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receive the signal from the line provided by the telephone cornpany and distribute it to the Wi-Fi receiver devices within their reach

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act as remote transmitters: they are used in locations that the router's Wi-Fi signal cannot reach

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Bluetooth relies on short-range radio frequency, and any device that incorporates the technology can communicate as long as it is within the required distance. This technology is normally used by personal computing devices, such as mobile phones and laptops.

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Infrared technology uses a transmission technique based on the light waves that move within the infrared spectrum. Maximum distance: one metre.