What is dual citizenship?
Dual citizenship is holding two passports and citizenship certificates of two differing nations. Dual citizens are nationals of two countries, and have rights bestowed upon citizens in each of these countries. Many nations do not permit dual citizenship, but the vast majority of nations in the world permit their citizens to apply and hold another citizenship of a foreign nation.
You may find a country that allows dual citizenship under certain circumstances, such as the European nation of Spain for example, as it only allows its citizens to obtain another citizen of specific, selected Latin American countries.
Other nations such as China, India, and Saudi Arabia do not allow any type of dual citizenship, automatically revoking the citizenship of its national if they do acquire another citizenship. China and Saudi Arabia have even gone so far as to consider it a criminal offense to obtain another citizenship without first renouncing the original one a person holds.
Multiple citizenship follows on the same premise of dual citizenship; as it refers to citizens that hold more than two citizenships of two countries or more. Becoming a multiple citizen is the best way to obtain global mobility freedom, as in traveling the world visa-free, and obtaining full financial freedom to become a true global citizen.
An important distinction to make is the difference between citizens and permanent residents. Having a citizenship status awards you with more rights and a passport, while holding a permanent residency of a nation allows you to enter and leave without a visa, make that nation your country of residence, and maintain your status as a permanent resident indefinitely on condition that you keep passing security clearance and pay tax, if applicable. Permanent residency cardholders do not have any political rights such as the right to vote or run for office in most countries, as they remain citizens of a foreign country and cannot obtain these rights unless they obtain citizenship through dual nationality, or in some cases, such as China, renouncing their original citizenship.