Whether it is a partnership oath, a charter or a partnership agreement or cooperation or friendship agreements, it should be submitted to the city or city council for debate on the ratification of the twinning with the partner city. The oath of partnership is then signed at an official public meeting and, as a rule, announced aloud to those present. The signatory cities are committed together, but this is not legally obligatory and there are no remedies, even if problems arise in the future. Even if this is rare, a local authority can at any time terminate the partnership by the city council, which cancels the ratification of the twinning. Twin or twin cities are a form of legal or social convention between cities, cities, counties, oblasts, prefectures, provinces, regions, states and even countries located in geographically and politically different areas, in order to promote cultural and commercial ties.  The modern concept of twinning, conceived after world War II in 1947, was designed to promote friendship and understanding between different cultures and between former enemies as an act of peace and reconciliation and to promote trade and tourism.  In the 2000s, twinning of cities was increasingly used to establish strategic international trade relations between member cities.   Cities that participate in twinning and twinning cities are sometimes made for political purposes. In 2013, the city of Gyongyus, Hungary, was associated with the Azerbaijani city of Shusha and signed the partnership agreement with representatives of the Azerbaijani government; Hungary recognized Shusha as a de jure part of Azerbaijan, although it was controlled at the time and until 2020 by the unrecognized Armenian and Artsakh armed forces.
 In 2003, Preston City Councillors in England attempted to establish a partnership with the Palestinian city of Nablus in the name of solidarity.  The term „twin cities“ is most widely used in the United Kingdom; the term „sister cities“ is generally used for agreements with cities in North and South America.   On the European continent, the most commonly used terms are `twin cities`, `twin cities`, `twin cities` and `friendship cities`. The European Commission uses the term `twin cities` and refers to the process as `twinning cities`.   Spain uses the term „ciudades hermanadas,“ which means „sister cities.“ Germany, Poland and the Czech Republic use the partner city (De) / miasto partnerskie (Pl) / partnerské mesto (Cz), which means „partner city“ or „partner city“. France uses twin city (twinning, twinning city or city) and Italy a gemellaggio (partnership) and comune gemellato (common partner).  In the Netherlands, the terms „Partnerstad“ or „Stedenband“ („urban borrowing“ when it comes to mutual assistance).