+**Measure Theory** is a fundamental branch of [Mathematics](/wiki/mathematics) that rigorously formalizes the intuitive concepts of size, such as length, area, and volume. It provides the essential framework for [Integration](/wiki/integration) and probability theory, extending these ideas to more complex spaces and functions.
+## See also
+- [Set Theory](/wiki/set_theory)
+- [Probability](/wiki/probability)
+- [Calculus](/wiki/calculus)