What does "fade out" mean?

What does fade out mean? Fade out means to gradually disappear, diminish, or become less intense until gone. In film and video, fade out is transition where image gradually darkens to black, signaling end of scene. In audio, fade out means music or sound gradually decreases in volume to silence, used at end of songs. As verb phrase, to fade out means to cause to disappear gradually, as in lights faded out. In social context, to fade out can mean to gradually withdraw, become less active, or disappear from social circle, similar to slow fade. In medical context, to fade out can mean to lose consciousness. Synonyms include dissolve, vanish, dwindle, ebb, and disappear. Opposite is fade in, where something gradually appears from nothing. In everyday use, interest fades out means declines over time, and person fades out of picture means leaves gradually. So fade out conveys gradual, not abrupt, ending or disappearance, whether visual image darkening, sound lowering, or presence diminishing, often used intentionally in media editing and figuratively for relationships or enthusiasm declining slowly until gone.