Line Follower Robot or Line Tracer Robot or Robot Tracer is an Autonomous Robot that follows a visual or magnetic line painted or embedded in the surface of locomotion. Line Follower Robot is a category of a mobile robot that is capable of moving in a surrounding relying on guidance devices that allow them to travel a pre-defined navigation route in relatively controlled space. Some of the Automated Guided Vehicles (AGVs) use magnetic or colour tape for the guide path and are usually used in warehouses for autonomously sorting/loading storage racks.