Domestic partner or domestic partnerhip identifies the personal relationship between individuals who are living together and sharing a common domestic life together but are not joined in any type of legal partnership, marriage or civil union. Some legal jurisdictions recognize that individuals who live together after a long period of time, while not entitled to common-law marriage status may be entitled to some protection under the legal concept of domestic partnership.
In some jurisdictions domestic partnerships are created by statute rather than having been the invention of judicial decisions. One of the reason for the creation of the relation of domestic partnership is to recognize the contribution of one partner to the property of the other. In the common law such devices such as the constructive trust are available to protect spouses, in legal marriage or in common-law marriage. In civil law jurisdictions this type of legal concept is generally not available so courts have tried to find alternative ways to protect the partner who has contributed to the other partner's property.
On September 4, 2003 California legislature passes expanded domestic partnership bill. The state assembly approved a measure to extend nearly all the legal rights of married couples to people in same-sex partnerships. If signed by the governor, the bill will become law in 2005.  New Jersey passed such a bill on January 8, 2004.