The printing industry is indeed a very large industry with many subsets. The screen printing art is one of the active lines of business in the printing industry. Screen printing basically is a printing technique in which a mesh is used to transfer ink onto a substrate, except in areas made watertight to the ink by a blocking stencil.
The process works in such a way that a blade or squeegee is moved across the screen to fill the open mesh apertures with ink, and a reverse stroke then causes the screen to touch the substrate momentarily along a line of contact. This process causes the ink to wet the substrate and be pulled out of the mesh apertures as the screen springs back after the blade has passed through it.
On the other hand, screen printing is also a stencil method of print making, in which a design is imposed on a screen of polyester or other fine mesh, with blank areas coated with a watertight substance. Ink is forced into the mesh openings by the fill blade or squeegee and by wetting the substrate, transferred onto the printing surface during the squeegee stroke.