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• The history of radio
• Radio waves and frequencies
• Words to Know
• Modulation

Radio is the technology that allows information to be transmitted and received over radio waves. Radio makes it possible to establish wireless two-way communication between individual pairs of transmitters/receivers and it is used for one-way broadcasts to many receivers. Radio signals can carry speech, music, or digitally encoded entertainment. Radio waves occur naturally in space or can be created by people. They are a long-wave form of electromagnetic radiation, or radiation that transmits energy through the interaction of electricity and magnetism.

The history of radio

In the nineteenth century, Scottish physicist James Clerk Maxwell (1831–1879) developed a...