What are white spaces?
The unused airwaves surrounding the frequencies used by TV broadcasters.
How they are used:
Google, Microsoft and other technology firms want to use these airwaves to offer mobile Internet service, hoping it will spark new products and services. But broadcasters and microphone makers say the technology could disrupt their signals.
What does that mean
Proponents say accessing white spaces would allow consumers to surf the Web wirelessly and let companies offer broadband to underserved areas.
The Federal Communications Commission is testing prototypes to decide whether they can operate in the airwaves, which will be available after the February switch to digital television.