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WAP's act as remote transmitters: used in locations where router's Wi-Fi signal cannot reach.

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

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Infrared waves are part of the electromagnetic spectrum. People encounter Infrared waves every day as heat. For example, a remote control uses infrared waves to change channels on your TV.

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Bluetooth allows devices to communicate with each other without cables or wires. Bluetooth relies on short-range radio frequency.

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Wi-Fi is a wireless networking technology that uses radio waves to provide wireless high-speed Internet access.

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The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or length of the wave. It's divided into separate bands, with different names for the waves within each band.