Naturalization is a process of acquiring citizenship by

Naturalization is the process through which a foreigner becomes a citizen of a country. This means that someone who was not born in that country can become a legal citizen with all the rights and responsibilities that come with it. To be eligible for naturalization, the person usually needs to be a resident of the country for a certain period of time and must meet certain requirements, such as having a good character, passing a language and/or civics test, and being willing to pledge loyalty to the country. Dual nationality means having citizenship of two or more countries at the same time, so it's not a process of acquiring citizenship but rather already having it. Foreign visitors to a country usually don't have the intention to become citizens, so they don't go through naturalization. And being born abroad doesn't necessarily mean someone needs to go through naturalization if one or both of their parents are already citizens of the country they were born in.