Donor milk refers to breastmilk that is provided by a woman who is not the mother of the baby being fed. This milk can come from a variety of sources, including donations from family members or friends, as well as from anonymous donors through organizations such as milk banks. Donor milk is often used for babies who are unable to receive their mother's own breastmilk due to medical reasons, such as premature birth or maternal health issues. It can also be used by mothers who choose not to provide their own breastmilk, either temporarily or permanently. Donor milk is considered a valuable resource for babies because it provides important nutrients and antibodies that can help them grow strong and healthy.