Which artist invented the collage art form, and in what year? what are artists doing, or what principle are they following when they created a collage?

Georges Braque and Pablo Picasso both coined collage in the beginning of the 19th century, where the artwork is made from and assemblage of different forms this creating a new whole, it became a distinctive part of modern art

The answer is true back then the word conversation had a different meaning then what we use it for today