collage
a. An artistic composition of materials and objects pasted over a surface, often with unifying lines and color.
b. A work, such as a literary piece, composed of both borrowed and original material.
2. The art of creating such compositions.

(Art Terms) an art form in which compositions are made out of pieces of paper, cloth, photographs, and other miscellaneous objects, juxtaposed and pasted on a dry ground

https://www.thefreedictionary.com/collaging

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Collage (from the French: coller, "to glue";[1] French pronunciation: ​[kɔ.laʒ]) is a technique of an art production, primarily used in the visual arts, where the artwork is made from an assemblage of different forms, thus creating a new whole.

A collage may sometimes include magazine and newspaper clippings, ribbons, paint, bits of colored or handmade papers, portions of other artwork or texts, photographs and other found objects, glued to a piece of paper or canvas. The origins of collage can be traced back hundreds of years, but this technique made a dramatic reappearance in the early 20th century as an art form of novelty.

The term collage was coined by both Georges Braque and Pablo Picasso in the beginning of the 20th century when collage became a distinctive part of modern art

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https://en.wikipedia.org/wiki/Collage