What a great question!
In the art world, stippling is a method of drawing or painting with a series of small dots to create texture and depth.
In the beauty world, stippling is a method of blending out creamy makeup products, like concealers, foundations, and lipsticks, to create a seamless, soft finish. To stipple, just apply the product a makeup sponge and use short strokes to lightly dab onto your face until blended.