Reunion registries were designed so adoptees and their birth parents, siblings or other family members can locate one another at little or no cost. In these mutual consent registries, both parties must have registered in order for there to be a match. Most require the adoptee to be at least 18 years old. Though they did not exist until late in the 20th century, today there are many World Wide Web pages, chat rooms, and other online resources that offer search information, registration and support.
Closed adoption, not to be confused with sealed records, is an adoption in which the adoptive family and the birthmother never meet and know nothing or very little about one another. With the advent of open adoption, closed adoptions have become the exception in domestic adoption rather than the rule. The term closed adoption is most often used in relation to post-adoption contact, whereas the term sealed records is related to the access of legal documentation surrounding the birth and placement of the adopted child once the adoption is final. It is entirely possible to have a closed adoption and unsealed records or an open adoption with sealed records. The two practices are not mutually exclusive.