Electrical signals through wires
Light signals through optical fibres
Radio waves through air
Any combination of these three
- Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber.
- Radio waves are used for wireless transmission of sound messages, or information, for communication, as well as for maritime and aircraft navigation.
- An electrical signal is a form of information transmission that is typically represented by voltage or current. It changes over time.
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