A surrogacy arrangement or surrogacy agreement is the carrying of a pregnancy for intended parents. There are two main types of surrogacy, Gestational surrogacy (also known as host or full surrogacy) and Traditional surrogacy (also known as partial, genetic, or straight surrogacy). In gestational surrogacy, the pregnancy results from the transfer of an embryo created by IVF, in a manner so the resulting child is genetically unrelated to the surrogate. Gestational surrogates are also referred to as gestational carriers. In traditional surrogacy, the surrogate is impregnated naturally or artificially, but the resulting child is genetically related to the surrogate. Intended parents may seek a surrogacy arrangement when either pregnancy is medically impossible or pregnancy risks present an unacceptable danger to the mother's health.