To adopt a child means to legally take on the responsibility of raising and caring for a minor as if they were one's own biological offspring. This usually involves going through an official process, such as filing paperwork and undergoing background checks, in order to become the legal guardian of the child. Adoption can occur through various means, including foster care adoption or international adoptions, but ultimately it is a way for individuals or families to expand their family by providing a loving home for a child who may not have one.