# Lines and Curves

Lines and curves are used to draw graphics output on raster devices. As discussed in this overview, a *line* is a set of highlighted pixels on a raster display (or a set of dots on a printed page) identified by two points: a starting point and an ending point. A *regular curve* is a set of highlighted pixels on a raster display (or dots on a printed page) that defines the perimeter (or part of the perimeter) of a conic section. An *irregular curve* is a set of pixels that defines a curve that does not fit the perimeter of a conic section.

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