曲綫係綫一種,兩端距離係任意,無直綫嘅限制。有啲曲綫按規律,如拋物綫等。喺平面入面嘅曲綫叫做平面曲綫(plane curve),立體空間入面曲綫就叫做空間曲綫(space curve)。
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Parabola.svg/320px-Parabola.svg.png)
喺拓樸學入面,曲綫嘅定義係由一個實線上面嘅開區間打去一個空間嘅連續函數;而喺微分幾何入面,定義都類似,不過個函數就要求係連續可微或者係光滑嘅。代數幾何入面就會研究代數曲線(algebraic curve),定義係一維嘅代數簇。
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