Crossfading is a video enhancing approach used to easily transition between two clips. By default, Premiere Professional makes use of a black crossfade, however you’ll be able to simply change it to white or another shade.
Altering the crossfade shade could be helpful for making a extra visually interesting transition, or for matching the colour of the clips you are transitioning between. It may also be useful for creating a particular temper or ambiance in your video.