Simple DC Motor/ Gear Motor:
A DC motor is the type that operates on a current that flows in one specific direction, like that produced by a battery. DC (direct current) motors are available in many different voltages. The 6 Volts common type usually works well on a range from 3 to 6V, which makes it a good choice for the Raspberry Pi on the 5V output or on an external power supply (battery) of 6V.
The gear motors come in various speeds that range from 10 rpm to 100 rpm. They have slow rotations; however, they provide an increased torque over the simple DC ones.
Connecting motors on the Raspberry Pi power output alone on any GPIO pins will not work because the Pi power source does not provide enough current to operate the motor. To overcome this issue, two different setups can be made. One way is to boost up the current from the Raspberry Pi power source using a transistor and the other way is to use an external power supply with a chip.
Programming 