Have you ever used a breast pump and what is the purpose of them?

Cryptic-Game
Have you ever used a breast pump and what is the purpose of them?
I have heard a few people promote breast pumps but forgot the purpose of them. Please explain what purpose they have. Do you happen to know?

Have you ever used one and if so, why?

Roughly how much do these pumps cost? Does it feel good to use?
Used and know (name purpose)
Vote A
Used and don't know
Vote B
Not used and know (name purpose)
Vote C
Not used and don't know
Vote D
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Have you ever used a breast pump and what is the purpose of them?
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