Definition & Meaning of "white Christmas"in English

What is the origin of the idiom "white Christmas" and when to use it?

The idiom "white Christmas" originated from the association of snowfall with the holiday season, particularly Christmas. It is used to symbolize a Christmas day where the ground is covered with a layer of snow, creating a picturesque and festive atmosphere. The phrase gained popularity through various cultural references, including songs, movies, and literature, which emphasized the desire for a traditional and snowy Christmas celebration.