A baby’s natural way of feeding is directly at mother’s breast.
Sometimes, for various reasons, this is not possible.
In such situations, some mothers choose to use manual expression or a breast pump to express their milk. Then they use a cup, spoon or bottle to feed the baby.
This way mothers can meet the baby’s need for food and still keep their own milk supply.
See How to Choose and How to Use for answers to your questions about pumping.