频道 (pín dào) means a TV or radio channel — a specific broadcast station or frequency band. Unlike 通道 (passageway), 管道 (pipeline), or 渠道 (canal/avenue), 频道 is used almost exclusively for electronic media. Its 'frequency' sense overlaps with 频率 (pín lǜ), but 频率 is the general scientific term while 频道 refers to a broadcast frequency as part of a channel lineup.