Adobe® Illustrator® is computer software that enables users to design, modify and edit vector graphics images from a computer and save them as files into a number of vector graphics formats. These formats are indicated by the file extension letters after the file name. The most popular formats are Encapsulated PostScript (EPS), Portable Document Format (PDF), Windows® Metafile (WMF), Scalable Vector Graphics (SVG) and Vector Markup Language (VML). The use of mathematical equations to generate points, lines, curves and other shapes is a difference between Adobe® Illustrator® and other graphics software programs on the market. This technique is known in the jargon of the industry as 'geometrical primitives' and is the basis of vector graphics. Contained within the software are a range of tools designed to allow a smooth interface between the user and the program. Using these tools, a competent operator can create brilliantly colored artwork, cartoon drawings and all kinds of illustrations and graphic material. The developers of Adobe® Illustrator® kept terminology relatively simple for users by using familiar words such as text, blend, trace, pen, brush and mesh. Source.