Printing using a frame covered in a fine taut mesh that ink is pushed through with a squeegee onto the paper, fabric, or wood beneath. Stencils and masked off areas are used to stop the ink going through unwanted areas of the mesh leaving behind the intended printed image. Layers of colour and tone can be created using different stencils and overlaying printing with careful registration.
Alternatively a newer technique is coating the screen mesh with light sensitive emulsion. When hardened this covers the holes in the mesh. An image is then transferred onto the screen by placing a negative image on plastic onto the screen and exposing it to bright light. The light bounces off the negative image but the parts that have been exposed to the light blast off the mesh with a power washer leaving the negative image on the screen. The image will print positively.