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Definition: It is the entirety of the frequencies of electromagnetic radiation.

Categories: It includes radio, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays

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Wi-Fi

How it works: This ensures data communication through radio waves and frequency bands mixing 2.4 GHz and 5 GHz.

Range: Within a building stands at around 100 meters while that outside is 300 meters maximally, in relation to the router used.

Examples of Devices: Laptops, PCs, up printers, smart devices, cameras.

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Bluetooth

How it works: Connects short-range wireless devices through a combination of radio waves that are limited in scope to a few meters.

Range: Predominantly 10 meters or thereabouts (Class 2) but Class 1 could extend to 100 metres.

Examples of Devices: Loudspeakers, headphones for communication, smart watches, mouse, and keyboard.

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Infrared

How it works: Encode and send information through infrared ray pulses, the angle of emission being very important.

Range: Approximately 5 meters at maximum, probably at most.

Examples of Devices: TV remotes, some data transmission devices, non-touch thermometers.