Synapse: Synapse is the small gap between two neurons where the transmission occurs. It's like the space between two people having a conversation.
Neurotransmitter: Neurotransmitter is a chemical messenger that carries the nerve impulse across the synapse. It's like the words spoken during a conversation that help convey the message.
Action Potential: Action potential is an electrical charge produced by a neuron during transmission. It's like hitting "send" on your text message, where an action (sending) takes place.