A mother is the biological or social female parent of a child or offspring, while the male parent is the father. The maternal bond describes the feelings the mother has for her (or another's) child.

In the case of a mammal such as a human, the mother gestates her child (called first an embryo, then a fetus) in the womb from conception until the fetus is sufficiently well-developed to be born. The mother then goes into labour and gives birth. Once the child is born, the mother's breasts produce milk to feed the child.

In non-sexual organisms, "mother" can sometimes be used to mean "parent"; in the case of single-celled organisms that reproduce by fission, the mother is a cell that divides to produce "daughters".

Mothers typically have a very important role in raising children, and the title mother can be given to a woman other than a biological parent who fills this role. This is most commonly either an adoptive parent or a stepmother (the wife of a child's father). The term can also refer to a person with stereotypical traits of a mother.