A range is a list of values for the trajectory to visit that is generated by a set of parameters.
In our example, the range is the list of values { 1.0, 2.0, 3.0, 4.0, 5.0 } that motorA will be set to. The parameters are start, end, and step. start determines the first value in the list, end determines the last value in the list, and step determines the uniform difference between values in the list.