system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is the difference between Dopamine, Endorphins and Serotonin?

I've seen all three being regarded as responsible for happiness and pleasure. Only endorphins seem to be regarded as responsible for the feeling of "being in love". 

Can anyone clear this up? What does each one do that the other doesn't? What do they have in common?
gpt
Two of the three of these are neurotransmitters, which are chemical messengers that relay information from one neuron to the next. The three you listed serve different purposes and complete different tasks.

Dopamine is a neurotransmitter that is linked with your pleasure systems in the brain.

Serotonin is another neurotransmitter linked with your sleep, dreaming, and general arousal.

Endorphins are morphine like chemicals that act as the brain's natural painkillers. 

I hope this answers your questions.