Cartesian geometries are a fundamental concept in mathematics that revolves around the work of philosopher and mathematician Rene Descartes, who was able to create a useful method of plotting points on a graph. Other synonyms for Cartesian geometries include rectangular coordinates, coordinate system, analytical geometry, or simply Cartesian coordinates. These terms all refer to the use of a system of two or three mutually perpendicular axes to represent the position of points in space. Other related terms include coordinate plane, coordinates, and grids, all of which are used to describe the use of Cartesian coordinates in mathematics, engineering, physics, and numerous other fields of study.