Screen printing or silk screen printing is a printing technique wherein a mesh is used to transfer ink onto a substrate. In areas where a stencil is in place, being impermeable to the ink, turn out as blank areas. Another definition puts it as 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 an impermeable substance.
Traditionally the name has been screen printing or silk screen printing because the mesh was of silk. Later the replacement was with synthetic threads like polyester. You also had different size of the mesh holes. The outcomes automatically bore different looks. There are also special materials available like nylon and stainless steel which have also been widely used with encouraging results.