frame|right|An example of a (simple, closed) curve: a hypotrochoid. In mathematics, a curve consists of the points through which a continuously moving point passes. This notion captures the intuitive idea of a geometrical one-dimensional object, which furthermore is connected in the sense of having no discontinuities or gaps. Simple examples include the sine wave as the basic curve underlying simple harmonic motion, and the parabola. Curves that close in on themselves, such as a circle, are commonly referred to as a loop. In everyday use of the term "curve", a straight line is not curved, but in mathematical parlance curves include straight lines and line segments. A large number of other curves have been studied in geometry.

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