+A **nonlinear system** is one where the output is not directly proportional to its input, meaning its behavior cannot be simply described by linear equations. Unlike [Linear System](/wiki/linear_system)s, small changes can lead to disproportionately large, complex, and often unpredictable outcomes, sometimes exhibiting phenomena like [Chaos](/wiki/chaos). Their study is crucial across many scientific and engineering fields.
+## See also
+- [Chaos](/wiki/chaos)
+- [Dynamic System](/wiki/dynamic_system)
+- [Bifurcation](/wiki/bifurcation)
... 1 more lines