A biological mother is a woman who has given birth to a child. She contributes half of the child's genetic material, which is passed down through her eggs. This biological connection is important in understanding family lineage and genetics. In many cases, a biological mother is also the primary caregiver, but this is not always the case. Some children may be raised by adoptive parents or guardians, while still having a biological mother who may or may not be involved in their lives. The relationship can vary widely based on individual circumstances and choices.