An Immigrant visa (Green Card) is one that provides eligibility to work and reside in US. You become a lawful permanent resident of US and there is no need for you to depend on H1- B working visas. A green card holder is not a US citizen and after getting green card, you have to apply for US citizenship in order to become one.
These Immigrant visas are issued mostly:
If your skills are needed by the US employer.
If you have close family members residing in US.
In addition to this, every year Immigrant visas are granted to investors, refugees, highly educated individuals & Green Card Lottery winners and such issue is subjected to the annual quota on each category.
H-1B Visa
