For donor conceived people, the biological parent(s) who "donated" sperm or eggs (though most commonly "donors" are financially compensated so "donor", while the most common term is a misnomer) are not legally recognized as parents and do not appear on their birth certificate. In many countries it is common for donor conceived people to be given no identifying information about their donor, however in some countries anonymous sperm and/or egg donation has been made illegal due to concerns for the medical and emotional needs of donor conceived people. Even in cases with anonymous donors, donor conceived people are sometimes able to connect with biological parent(s) and/or half siblings conceived from the same donor using DNA testing or through online registries for donor conceived people.