+A **complex number** is a number that can be expressed in the form `a + bi`, where `a` and `b` are [Real Number](/wiki/real_number)s, and `i` is the [Imaginary Unit](/wiki/imaginary_unit). These numbers extend the one-dimensional number line to a two-dimensional [Complex Plane](/wiki/complex_plane), offering solutions to all polynomial equations.
+## See also
+- [Real Number](/wiki/real_number)
+- [Imaginary Unit](/wiki/imaginary_unit)
+- [Complex Plane](/wiki/complex_plane)
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