Sister city
Sister cities or twin towns are local school and/or chamber-of-commerce programs designed to foster international communication and cooperation. Like the city version of a "pen pal", a city is "twinned" with one or more international cities. The programs might include exchange students or economic programs.The Sister Cities program was begun in 1956 by Dwight Eisenhower.
See also Twin Cities, an unrelated terminology that describes two geographically proximal cities which function much like a single larger city.
