Geometric Dimensioning is a system used in engineering and manufacturing to define the size, shape, and allowable variations of parts. It provides a clear and precise way to communicate the design intent, ensuring that parts fit together correctly and function as intended. This system uses symbols and annotations on technical drawings to convey important information about the geometry of the part. By using GD&T (Geometric Dimensioning and Tolerancing), engineers can specify features like flatness, roundness, and parallelism. This helps in minimizing errors during production and assembly, ultimately leading to higher quality products. Understanding GD&T is essential for anyone involved in design, manufacturing, or quality control.