In a car audio context, this can refer to two things. The first is the most common usage: radio frequency. Radio stations are each accessed via tuning into their frequency band. The second meaning is sound frequency. High sounds are high frequency (which are ideally played via power-efficient tweeters), with lower sound sent via lower frequencies, which take more power to play and are if at all possible played through woofers. Equalisation (EQ) involves balancing the volumes of these different frequency bands to get the required playback.

all radio control gear works on frequencies. Best explained here.

(see "Band")

The band on which a unit is to operate its radio communications.

In Windows Media Player, the number, such as 88.5 or 101.7, used to locate a radio station. genre In Windows Media Technologies, the type of music, such as rock or classical, played by a radio station. header A part of the file structure that contains information required by an application to decompress and render the content. The header in a protected file also contains information required to get a license.

The assigned channel in which a TV or radio station can transmit a singal.

Refers to the type of wireless band that a wireless network device operates in. All devices that emit radio waves (i.e. microwaves, telephones, wireless networking products) work in certain frequency bands. In the wireless networking world, the most commonly used frequencies are 2.4GHz and 5GHz. 802.11g and 802.11b wireless network devices operate in the 2.4GHz band, 802.11a devices work in the 5GHz band.