Radio: The

: A newer concept in 6G mobile networks (Soft, On-demand, Lite, Intelligence, Digital, and Security) designed to make next-gen radio communication more efficient.

If you tell me more about what you're looking for—like if you're asking about (like Spotify's "Radio"), amateur ham radio gear, or physical design —I can give you a more specific answer. The radio

Modern radios are almost exclusively solid-state because this technology offers several critical advantages over vacuum tubes: : A newer concept in 6G mobile networks

Depending on what you're looking for, you might also be referring to: amateur ham radio gear

: The physical ability of radio waves to pass through "solid" objects like walls or ice, which depends heavily on the frequency of the signal.