Under the U.S. Immigration laws there are various Employment Based ( EB) categories,as in this case number 5 ( EB-5), that allows U.S.permanent residency. The EB-5 category allows a foreign national investor by investing in a new commercial enterprise and creating ten jobs to obtain U.S.permanent residency.
EB-5 is an "immigrant visa" category. There are also many "non-immigrant visa" categories which you may have heard of such as a tourist visa or an H1-B specialty occupation worker visa. Even "adjustment of status" by USCIS inside the U.S. eats up an immigrant visa number.