Two-channel analog audio signals that use one red (right) and one white (left) RCA connector for wiring consumer electronics equipment. For higher performance, professional audio equipment may use balanced XLR connections instead of RCA, or offer both XLR and RCA. See RCA connector
and XLR connector
Analog Stereo Jacks
Red and white RCA sockets are found on myriad devices for supporting traditional analog audio signals.