Hamiltonian mechanics is a reformulation of classical mechanics that provides a powerful framework for analyzing physical systems. It is based on the principle of energy conservation and uses a function called the Hamiltonian, which represents the total energy of a system. This approach allows for a clearer understanding of complex systems and is particularly useful in fields like quantum mechanics and statistical mechanics. In Hamiltonian mechanics, the motion of a system is described using generalized coordinates and momenta, which simplifies the equations of motion. This method emphasizes the role of symmetries and conservation laws, making it easier to solve problems involving multiple interacting particles or fields.