Hong Kong, a former British colony, was handed back to China in 1997 following a 1984 agreement between China and Britain.
China agreed to govern Hong Kong under the principle of "one country, two systems", where the city would enjoy "a high degree of autonomy, except in foreign and defence affairs" for 50 years.
As a result, Hong Kong has its own legal system, and rights including freedom of assembly and free speech are protected.
Its leader, the chief executive, is currently elected by a 1,200-member election committee. A majority of the representatives are viewed as pro-Beijing.
Hong Kong's mini-constitution, the Basic Law, says that "the ultimate aim" is to elect the chief executive "by universal suffrage upon nomination by a broadly representative nominating committee in accordance with democratic procedures".