What is the green card in America? Is there a green card only in America? Do they exist in other countries?

The so-called American green card is the American permanent resident card, also known as the green card.

Card) is an identity card used to prove that foreigners have the status of permanent residents in the United States of America. "Getting a green card" refers to the immigration process of becoming a permanent resident. The legal permanent residency of green card holders is an official immigration benefit, including conditional permission to stay in the United States and get a job. The holder must maintain his permanent resident status, and if he no longer meets certain conditions required by the status, the holder may lose his status.

Many other countries have green cards, and most of them allow immigrants with green cards.

Because getting an American green card will be more convenient to do things in the United States, and it has an advantage over people who don't get a green card.