ABSOLUTE COORDINATES:

Absolute Coordinates uses the Cartesian System to specify a position in the X, Y, and (if needed) Z axes to locate a point from the 0-X, 0-Y, and 0-Z (0,0,0) point. To locate a point using the Absolute Coordinate system, type the X-value, Y-value, and, if needed, the Z-value separated by commas (with no spaces).

Example:
If you type 12,8 for a position, AutoCAD will locate an entity or part of an entity 12 along the X-axis and 8 along the Y-axis.