Statistical physics is a branch of physics that uses statistical methods to explain and predict the behavior of systems with a large number of particles. It connects the microscopic properties of individual particles, such as atoms and molecules, to the macroscopic properties of materials, like temperature and pressure. This approach helps in understanding phenomena in various fields, including thermodynamics and condensed matter physics. By applying probability theory, statistical physics provides insights into how systems evolve over time and reach equilibrium. It plays a crucial role in explaining concepts like entropy and phase transitions, which are essential for understanding the behavior of gases, liquids, and solids in different conditions.