Outline fonts are fonts which that use geometric outlines of letter and characters. The main advantage of outline fonts is that they are easily scalable so they can be sized up or sized down without distorting the shape.

Outline fonts or vector fonts are collections of vector images, consisting of lines and curves defining the boundary of glyphs. Early vector fonts were used by vector monitors and vector plotters using their own internal fonts, usually with thin single strokes instead of thickly outlined glyphs.