+The Principle of Least Action states that a physical system's evolution between two points in time follows a path where a quantity called [Action](/wiki/action) is extremized. This elegant concept unifies many areas of physics, from [Classical Mechanics](/wiki/classical_mechanics) to quantum field theory, offering a profound variational formulation.
+## See also
+- [Lagrangian Mechanics](/wiki/lagrangian_mechanics)
+- [Hamiltonian Mechanics](/wiki/hamiltonian_mechanics)
+- [Variational Calculus](/wiki/variational_calculus)
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