• A coordinate system is a set of numbers that allows you to specify the location of a point in some space. The Cartesian coordinates is one such system, which uses a set of three numbers to specify the distance of a point from three perpendicular planes.
  • On a plane, Cartesian coordinates use a pair of numbers – one on the x-axis, one on the y-axis – that can be used to locate a specific point on the plane. In three dimensions, the point’s location can be fixed by adding one more number, e.g. the floor of the building you are on.
  • The French philosopher and mathematician René Descartes created this system in the 17th century. His invention bridged the gap between algebra and geometry and created analytic geometry.