Johannesburg is the largest city in South Africa and the provincial capital of Gauteng. It’s situated in the eastern plateau area of South Africa. Johannesburg is among the world's leading financial centers and one of the most significant economic powerhouses in Africa. It is the country’s financial, transportation, and cultural centre. Since the late 19th century, Johannesburg has been known for its influence in finance and diamond trade. It is famous for its breathtaking skyline, gold mining heritage, and vibrant culture. Some of the places that make it famous include the Apartheid Museum, Gold Reef City, Johannesburg Zoo, and the Constitution Hill.

A census in South Africa is conducted every 10 years and 2011 was the last time that it was conducted. The next census is scheduled for 2021. According to the 2011 census, Johannesburg had a population of 4.43 million. Johannesburg is known for its cultural and ethnic diversity. According to the 2011 census, 76.4% of the population is Black African, 12.3% is White, 5.6% is Coloured and 4.9% is Indian/Asian. When it comes to religious beliefs, Christianity is the dominant religion, followed by traditional African religions, Islam, and Hinduism. Johannesburg is a multilingual city with eleven official languages, including Zulu, English, Afrikaans, and Sotho. The city is also known for its sports culture, hosting several international sports events including the 2010 FIFA World Cup.

Johannesburg is governed by the Johannesburg Metropolitan Municipality, which provides municipal services for the city. The municipality is divided into seven regions, each with its own director and regional office. The city council consists of 270 seats, divided between ward councillors (who represent a specific geographic area) and party councillors (who represent their political party). The executive mayor is the highest official in the municipality and is responsible for strategic and political management. The municipal manager is the administrative head of the municipality and is responsible for tasks and functions as assigned by the mayor, the executive committee, and the council.

Johannesburg is one of Africa's largest economies and is the hub of South Africa's economic activity. The city thrives in trade and commerce and has a vibrant business culture. It has a GDP of over R305 billion, which is about 15 percent of South Africa's total GDP. The city's economy is larger than that of several African nations. The mining industry, manufacturing, services, and retail are some of the sectors that contribute to the city’s economy.

Johannesburg has a well-developed infrastructure that supports its status as a major global city. The city’s infrastructure includes transport, energy, water and digital connectivity. Transport infrastructure includes a bus rapid transit system, the Gautrain rapid rail system, and OR Tambo International Airport, Africa's busiest airport. The city is also working on expanding its broadband network to boost digital connectivity. Some of the investment is provided by the private sector, and the city’s authorities are actively working towards improving the infrastructure to meet the growing needs of the city and its population.