Jigs are tools that hold a cutting tool in place or guide it as it performs a repetitive task like drilling or tapping holes. Fixtures, on the other hand, do not guide a cutting tool, but hold a workpiece steady in a fixed position, orientation, or location.Jigs are used in uni-dimensional machining processes like drilling, tapping, and reaming. Jigs are indispensable in the machining process. They help guide and hold workpieces to a specified location, thus ensuring that any drilling or tapping will be accurate.