+A **tangent line** is a straight line that "just touches" a [curve](/wiki/curve) at a single [point](/wiki/point), sharing its direction at that specific instant. Its slope precisely matches the [derivative](/wiki/derivative) of the curve at that point.
+## See also
+- [Secant Line](/wiki/secant_line)
+- [Normal Line](/wiki/normal_line)
+- [Calculus](/wiki/calculus)
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