Geometric tolerances are specifications that define the allowable variations in the shape, size, and orientation of a part in engineering and manufacturing. They ensure that parts fit together correctly and function as intended, even if they are not produced with perfect precision. This is crucial for maintaining quality and performance in products. These tolerances are often represented on technical drawings using symbols and annotations. Common types include flatness, cylindricity, and parallelism. By using geometric tolerances, engineers can communicate the necessary limits for manufacturing processes, helping to reduce errors and improve overall product reliability.