The OFFSET command makes copies of object(s) parallel to the current position at a distance you nominate. Offset allows you to copy lines, arcs, polylines, etc. and paste them at a measured distance.

Offset Using the offset tool in LiteCAD.exe. We copy a line 5 units (feet) to the right to create a path.

Offset copies of lines are always parallel to the original.
Offset copied of an arc or circle are always CONCENTRIC with the original.