Pressure-Volume-Temperature (PVT) analysis is a crucial aspect of reservoir engineering and production optimization. It involves studying the behavior of petroleum fluids (oil, gas, and water) under different pressure, volume, and temperature conditions, typically within reservoirs or wellbores. This analysis helps in determining important parameters such as fluid properties, phase behavior (e.g., whether the fluid is in gas, liquid, or mixed phase), and reservoir performance characteristics, which are essential for reservoir management, production forecasting, and overall field development planning.