Coordinates give you a more precise method of drawing than using the mouse. Instead of pointing, clicking, and dragging the mouse, you can enter numbers for coordinates for an object's origin (starting point) and its ending point, or for an object's width and height.
The Object Coordinates dialog box gives you several methods for specifying the size and position of an object, as well as some actions that let you point and click with the keyboard, without using a mouse or other pointing device.