Final answer:
The space between two neurons is called the synaptic cleft, and it is important because it is where neuronal signals are communicated.
Step-by-step explanation:
The space between the two neurons is called the synaptic cleft. It is the junction where neuronal signals are communicated. The synaptic cleft plays a crucial role in transmitting information between neurons. When an action potential reaches the end of an axon, it stimulates the release of neurotransmitter molecules into the synaptic cleft. These neurotransmitters then travel across the synaptic cleft and bind with corresponding receptors on the dendrite of the adjacent neuron, leading to the generation of a new action potential in the postsynaptic neuron.