Dual Citizenship means you are a citizen of two countries at the same time.
Not all countries allow this. If you acquire a new citizenship then you often have to give up the old one.
The rules for acquiring citizenship vary greatly and are often complicated. They usually require you to be a legal resident of that country for a number of years, to speak the language, not to have a criminal record, and other restrictions. If you want to acquire a second citizenship, you will have to research how to become a citizen of that specific country.
You can apply for dual citizenship to the USA and almost any other country. Many more people than you might think hold dual citizenship. But the road to dual citizenship, with only a few exceptions, is long, twisting and full of "gotchas".
No husband has to apply again for himself because shared visa like spouse can be granted or extended but not the citizenship for an individual.
Yes, you can apply for German citizenship and be a dual citizen regardless of the fact if your mother was still a German citizen or not.
India does not allow dual citizenship. But you can apply and get a passport-like booklet, at the nearest embassy and consulate general, that will allow you to travel to India visa-free.
Not unless you renounce your Canadian citizenship voluntarily.
If you apply for citizenship in another country your US citizenship is automatically revoked. The US does not recognize dual citizenship. You revoke it in writing at a US embassy, outside the US.
Americans can live in Canada if they apply for permanent residence. They do not, however, need to "give up" their citizenship and may apply for a dual citizenship. They will have both a Canadian and their American citizenships.
The US recognizes dual citizenship.
India does not allow dual citizenship.
Yes, Thailand allows dual citizenship.
Dual citizenship is when one has citizenship rights in two countries.
No difference in the meaning but when people talk about Immigration and citizenship topics, almost all of them use the term 'Dual Citizenship'.