签证类型f是什么意思？
1. 美国留学学生签F1，即Foreign Student/Student Visas Students who are non-US citizens and enroll as full-time students at an accredited college or university in the United States， must apply for one of two visa types， F或者M. M stands for “Exchange Visitor” which includes both student (F1)and instructor visas (J1)， while F is used specifically to designate a "student" status. The main difference between J and F visas is that F1 holds the right to work off their studies， whereas on a J1 you do not have permission to participate in paid employment except during your 6-month "segment，" unless you get a waiver from USCIS.
2. 日本留学学生签F15，即外国人留学生就労许可 This category is intended for foreigners who wish to study at Japanese universities或专门学校等教育机构; it allows them to stay in Japan legally with permission to seek gainful employment after they finish school or drop out， but only up until three months before their valid visa period expires. The application process usually takes around six weeks and costs about 30，000 yen. After getting his or her passport back and IQC stamped， the applicant will be granted what’s called an “A-visa，” meaning they can enter Japan anywhere within four years starting from when the passport was handed over by the embassy. In order to change this visa into an employment-permitted one， applicants should submit a request form along with various documents to the relevant immigration office once in the country. However， there may be problems because some cities don't have these offices or they might be closed weekends or public holidays.