What is the difference between the three types of neurons?

Sensory neurons - (touch, odor, taste, sound and vision) are are nerve cells that transmit sensory information. They are activated by sensory input, and send projections to other elements of the nervous system, ultimately conveying sensory information to the brain or spinal cord.
Interneurons - Interneurons create neural circuits, enabling communication between sensory or motor neurons and the central nervous system. They have been found to function in reflexes, neurolan oscillations.....
Motor neuron - (muscles, glands) they carry signals from the spinal cord to the muscles to produce (effect) movement.
Neurons are the basic structural unit of the nervous system. And these are classiffied as to whether they are mylenated or not.
Or perhaps you are thinking of (1) sensory (afferent) neurons which transmit impulses from the skin and other sensory organs or from various places within the body to the CNS. (2) Motor (efferent) neurons transmit impulses from the CNS to effectors (muscles or glands) and (3) interneurons.
And motor neurons are further classified according to the effectors they target. The somatic nervous system (SNS) directs the contraction of skeletal muscles. The autonomic nervous system (ANS) controls the activities of organs, glands, and various involuntary muscles, such as cardiac and smooth muscles.