impasto
A painting technique where paint is laid on an area of the surface thickly, usually thick enough that the brush or painting-knife strokes are visible. Paint can also be mixed right on the canvas. When dry, impasto provides texture; the paint appears to be coming out of the canvas.
The technique is commonly achieved with oil or acrylic paint due to their thicker consistency.
Can be synonymous with impressionism, the difference being the depth of the paint