The Cartesian Coordinate System is a two-dimensional grid used to locate points in a plane. It consists of two perpendicular lines called axes: the horizontal line is the x-axis, and the vertical line is the y-axis. Each point on the grid is identified by a pair of numbers, known as coordinates, which represent its position relative to the axes. In this system, the point where the axes intersect is called the origin, represented by the coordinates (0, 0). The quadrants are the four sections created by the axes, each having a unique combination of positive and negative values for the coordinates.