Robot design. Computer graphic of a robot arm in operation as part of a Computer-Aided Design (CAD) package. The arm (red) is machining a workpiece (blue) which is held by a stand (green). The computer graphic will respond to commands in the same way as a real robot arm would. Computer simulations like this can be used to program the robot arm or allow an examination of how its operational efficiency can be improved. Robots are widely used in industry to perform repetitive, precision tasks such as machining.