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Adobe Illustrator was first produced in 1987 and currently it's latest incarnation is CS4 (v14). It's main function is for producing vector based graphics/designs. It's native file format is .ai but also can output .eps and pdfs. Newer versions can export most mainstream bitmap file formats. The key benefit of vector drawings is that they can be scaled from a fraction of an inch in size up to a few feet across with no loss of quality.
for further information see http://www.adobe.com/products/illustrator/main.html
Perfect Dotted Line in Illustrator?
Center an Image in Illustrator?
Pencil Drawings in Illustrator?
Customizing Glyphs/Illustrator Grid
Pen Tool in Illustrator
Control Handles in Illustrator
Paste from Illustrator into Fontlab?
Getting "Special" Characters into Illustrator
Drawing Outlines: Illustrator vs. FontLab
From Illustrator to Working Font
Shading in Illustrator