Cells in the nervous system communicate to each other across gaps called

Cells in the nervous system communicate with each other across gaps called synapses.
A synapse is a junction between two neurons (or neuron and effector cell) that allows them to pass an electrical or chemical signal to one another. A synapse can be chemical when cells communicate using chemical messengers, like neurotransmitters. Other synapses are electrical when ions flow directly between cells.

Dthrough a slow process