Surrogacy is an arrangement, often supported by a legal agreement, whereby a woman agrees to become pregnant, carry the pregnancy to due term, and give birth to a child or children, all the foregoing for and on behalf of another person or persons, who are or will ultimately become the parent(s) of the newborn child or children. People may seek a surrogacy arrangement when pregnancy is medically impossible, when pregnancy risks present an unacceptable danger to the mother's health, or when a man alone or a male couple wishes to have a child. In these arrangements, monetary compensation may or may not be involved. Receiving money for the arrangement is considered commercial surrogacy; receiving no compensation beyond reimbursement of reasonable expenses is altruistic. The legality and cost of surrogacy varies widely between jurisdictions, sometimes resulting in problematic interstate or international surrogacy arrangements.