美国学生签证属于哪一类？
F-1 (Academic) 学术类，去美国上学的学生。 申请该类签证时，需要提供I-20表格。
M-1(Vocational/Professional)， M-2 (Language training only )培训类或语言学习类，主要是一些专业培训和英语培训课程（包括ESL）。 申请该类签证时，也需要提供I-20表格。 F-1， M-1，和M-2签证都是非移民签证
O-1， O-2， and P-1， P-2， P-3 visas are all for people with extraordinary abilities or skills.
Q-1 is a special nonimmigrant program for foreign nationals who enroll in programs sponsored by the US government to promote cultural exchange.
R-1 visa allows religious workers， R-2 visa holders are the spouses of R-1 Visa Holders， to work legally and live temporarily in the United States while assisting at churches etc. These Visas are not intended for ordinary， paid employees.
T-1 and T-2 are temporary visas that allow foreign scientists who have received requests from US companies to come here on a special basis. T visas do not require sponsorship by an employer， but they must be used within one year of getting them. The period can be extended under certain conditions.
U-1 through U-5 are employment visas issued in limited circumstances where it would otherwise violate immigration laws to employ someone without proper authorization. They were created as a safety valve to give immigrant workers legal status when no other category applies， usually during periods of high unemployment. Examples include seasonal agricultural workers ， and members of professional sports teams coming into the country before their competition begins to train.
USCIS currently offers some online information about the various types of visas： URL URL