+A [Field](/wiki/Field) extension constructs a larger algebraic structure from a smaller one, like expanding a known mathematical universe. It enables finding roots for polynomials that wouldn't exist within the original field, enriching its set of numbers.
+## See also
+- [Galois Theory](/wiki/Galois_Theory)
+- [Polynomial](/wiki/Polynomial)
+- [Algebra](/wiki/Algebra)