The United Arab Emirates (UAE) is a federation of seven emirates governed by hereditary emirs and a single national president. Abu Dhabi is the capital and largest emirate, making up 87% of the UAE's total land area. The economy relies heavily on oil exports, with the UAE having some of the highest per capita incomes and lowest unemployment rates in the world. Islam is the dominant religion and Arabic is the official language, though English is also widely spoken due to the diverse expatriate population that makes up the majority of residents. Tourism is a major industry, with the UAE seeking to attract visitors with its modern infrastructure, luxury hotels and shopping malls.