A stencil is a tool used to create a design or lettering by allowing paint or ink to pass through cut-out shapes onto a surface, leaving a pattern or image behind. This technique is popular in various forms of art, particularly street art and graffiti, as it enables artists to produce sharp, defined images quickly and consistently. Stencils can be made from various materials, including plastic, metal, or cardboard, and are often used for both artistic expression and political statements.