By extending an axon to meet another neuron's dendrites or cell body. At the synapse, the first neuron releases neurotransmitters, which are chemical messengers that travel across a small gap and bind to the second neuron, causing it to either fire its own signal or remain quiet. This entire process is a fundamental mechanism of how neurons communicate, and it can be strengthened or altered through activities like learning and repetition, a phenomenon known as neuroplasticity. Read more from here...