According to the function of the transmitted neural impulse which are the types of neurons? How different are the concepts of afference and efference of the neural impulse transmission?

There are three types of neurons: afferent neurons, efferent neurons and interneurons. Afferent neurons are those that only convey sensory information from the tissues to neural nuclei and ganglia (where they make link with interneurons or effector neurons). Efferent neurons are those that transmit commands to tasks performed in various parts of the body. Interneurons, also called as association neurons or relay neurons, serve as connection among two other neurons.