Pen pal - Wikipedia Purposes. A pen pal relationship is often used to practice reading and writing in a foreign language, to improve literacy, to learn more about other countries and lifestyles, and to make friendshipse the expansion of the Internet has reduced the number of traditional pen pals, pen pal clubs can nowadays be found on the Internet, in magazine columns, newspapers, and Screen printing - Wikipedia Screen printing (traditionally called silkscreen printing; also known as serigraphy and serigraph printing) is a printing technique where a mesh is used to transfer ink (or dye) onto a substrate, except in areas made impermeable to the ink by a blocking stencil.A blade or squeegee is moved across the screen to fill the open mesh apertures with ink, and a reverse stroke then causes