Heat is a form of energy that is transferred between systems or objects with different temperatures. It flows from the hotter object to the cooler one until thermal equilibrium is reached. This transfer can occur through conduction, convection, or radiation, and is a fundamental concept in physics and engineering. In everyday life, heat plays a crucial role in various processes, from cooking food to powering engines. Understanding heat and its transfer mechanisms is essential for designing efficient systems in industries such as Thermal Engineering and HVAC (Heating, Ventilation, and Air Conditioning).