The reader is expected to develop their own robot, and thus you will be required to learn about drive mechanisms and a choice of chassis. Ideally, there are two types of drive mechanisms and the choice for the chassis is done on the basis of the drive mechanism used. Normally we don't want a chassis that over-stresses our motors, nor do we want one that may get stuck while exposed to the outdoor environment. In a typical line follower robot, as discussed in Chapter 5, Autonomous Robotics with Intel Edison, the most common and the most widely-used drive mechanism is a two-wheel drive, as normally these operate on smooth surfaces and in indoor environments.