Parametric modeling is a computer-aided design (CAD) technique used to create and manipulate geometric models. Parametric modeling is based on the idea that the geometry of a model can be defined by a set of parameters, such as dimensions, angles, and radii. These parameters can be varied to change the shape and size of the model, and the changes made to the parameters are automatically reflected in the geometry of the model.

Parametric modeling is commonly used in engineering, architecture, and other fields where precise and flexible control over the geometry of a model is required. Parametric modeling allows designers to quickly and easily create and modify complex shapes, and to make changes to a design without having to redraw the entire model. Parametric modeling also enables designers to create parametric relationships between different parts of a model, so that changes to one part of the model automatically propagate to other parts of the model. This makes it possible to quickly explore a wide range of design options and to make changes to a design with minimal effort.