In a Cartesian coordinate system, the second dimension is typically associated with the Y-axis. In such a system, points are located using two coordinates: one along the X-axis (horizontal) and the other along the Y-axis (vertical). The combination of these two coordinates specifies a unique position in a two-dimensional space.
So, if you have a point (x, y), the ‘x’ value corresponds to its position along the X-axis (the first dimension), and the ‘y’ value corresponds to its position along the Y-axis (the second dimension). Together, these values define the point’s location in a two-dimensional plane.