Fluid characterization is a fundamental process in the oil and gas industry that involves analyzing and understanding the properties of reservoir fluids. This critical step provides crucial insights into fluid behavior under various reservoir conditions and aids in the design and optimization of production strategies. Fluid characterization includes determining the composition, phase behavior, density, viscosity, and other essential parameters of the hydrocarbons present in a reservoir. PVT (pressure, volume, temperature) analysis is a common method used to gather data on fluid properties at different conditions. The information obtained from fluid characterization is vital for reservoir engineers to predict reservoir performance, estimate recovery factors, and design production facilities. Advanced analytical techniques, such as chromatography and spectroscopy, contribute to accurate fluid analysis. Fluid characterization also plays a crucial role in enhanced oil recovery (EOR) projects, as it helps in selecting appropriate injection fluids and designing injection strategies. The dynamic nature of reservoir fluids requires continuous monitoring and updating of fluid characterization throughout the lifespan of a reservoir to adapt to changing conditions and optimize production efficiency.