Decoupage

It is a traditional decorative technique that involves cutting out images (usually from paper or decorative napkins) and gluing them onto objects (wood, glass, ceramic, etc.), covering them with varnish or glue to visually integrate them.

Formal Definition:
Decoupage is an artistic surface decoration technique that involves adhering paper or fabric cutouts to a base surface, followed by the application of finishing layers (varnish, lacquer, etc.) to seal and protect the decoration.