Thermodynamics is a branch of physics that deals with the study of heat and how it affects energy in various systems. It is concerned with the behavior of energy and matter as they interact with each other in controlled or uncontrolled systems. This study involves the principles of energy transfer, conversion, and storage. The study is based on the four fundamental laws: The zeroth law, the first law, the second law, and the third law of thermodynamics. Some of the key topics studied in thermodynamics include thermodynamic systems, thermodynamic processes, thermodynamic properties, phase transitions, thermal equilibrium, and entropy. The principles of thermodynamics are applied in various fields such as engineering, physics, geology, chemistry, and biology.