Typography from the Greek words is the art and technique of arranging type, type design, and modifying type glyphs. Typeglyphs are created and modified using a variety of illustration techniques. The arrangement of type involves the selection of typefaces, point size, line length, leading line spacing, adjusting the spaces between groups of letters tracking and adjusting the space between pairs of letters kerning.Typography is performed by typesetters, compositors, typographers, graphic designers, art directors, comic book artists,graffiti artists, and clerical workers. Until the Digital Age, typography was a specialized occupation. Digitization opened up typography to new generations of visual designers and lay users.