My passport type is F. What is the significance of this type of passport? Urgent!

In order to facilitate identification and management, some countries use different letter codes to indicate visas issued according to different reasons of visa applicants. This letter code is the visa code.

At present, the most commonly used visa codes in the United States, among which non-immigrant visa codes are as many as 18, and each category is subdivided into multiple items. A brief introduction is as follows:

(1)A visa (i.e. diplomatic official visa) is issued to:

A- 1: ambassadors, ministers, career diplomats, consular officials and their families of foreign governments accredited to the United States;

A-2: other officials, employees and their families of foreign governments;

A-3:A- 1 and A-2 visa holders' entourage, servants, private employees and their families.

(2) Class B visa (i.e. business tourist visa) is issued to: B- 1: short-term stay personnel for the purpose of dealing with business, inspection, visit and other related affairs; B-2: Visiting relatives and friends and traveling for a short time.

(3) Class C visas (i.e. transit visas) are issued to:

C- 1: foreigners in transit;

C-2: Foreigners in transit at United Nations Headquarters in new york;

C-3: Foreign government officials, attendants, servants, private employees and their families in transit.

(4) Class D visas (i.e. crew and seamen visas) are issued to:

Crew members on international flights and seafarers on ships of various countries.

(5) Class E visa (i.e. international treaty or agreement investor visa) is issued to:

E- 1: spouses and children of those who do business in the United States according to international treaties or agreements;

E-2: Investors and their spouses and children are in the United States according to international treaties or agreements.

(6) Class F visas (i.e. study visas) are issued to:

F- 1: overseas students (that is, self-funded students);

F-2:F- 1 Spouses and children of visa recipients.

(7) Class G visas (i.e. visas for employees of international organizations) are issued to:

G- 1: the chief permanent representative of a foreign government accredited to an international organization, the staff under his representative and the family members of the above-mentioned persons recognized by the government;

G-2: other foreign government representatives accredited to international organizations recognized by the government and their families;

G-3: representatives of foreign governments and international organizations and their families who are not recognized by the government, or representatives of foreign governments and their families who are not members of international organizations;

G-4: officials, employees and their families of international organizations;

G-5: the entourage, servants, private employees and their families of the above-mentioned G 1-G4 visa holders.

(8) Class H visas (i.e. temporary employee and intern visas) are issued to:

H- 1: foreigners who work temporarily with special professional skills;

H-2: foreigners who work temporarily because of the lack of a certain type of work or occupation in China;

H-3: foreigners receiving various trainings;

H-4: spouses and children of the above-mentioned H- 1 ~ H-3 visa holders.

(9) A first-class visa (that is, a journalist visa) is issued to:

Representatives, journalists, spouses and children of American news, radio, television and other institutions.

(10) class j visa (i.e. exchange visit visa) is issued to:

J- 1: international students, advanced students and various scientific researchers sent according to the bilateral exchange and visiting scholar program approved by the government;

J-2: Spouses and children of visa recipients.

K visa (i.e. marriage visa) is issued to:

K- 1: foreigners who have to go to the United States to marry American citizens;

K-2: Adult children of visa holders.

(12) class l visa (i.e. employee visa of multinational company) is issued to:

L- 1: personnel of subsidiaries, offices or international enterprises of American multinational companies temporarily working in the United States;

L-2: Spouses and children of visa holders.

(13)M visa (i.e. non-academic international student visa) is issued to foreign students studying full-time in American vocational universities or colleges.

(14)N visas (that is, accompanying visas for parents and children of some special immigrants) are issued to the families (parents and children) brought by the staff of some international organizations during their employment in the United States.

(15)O visa (i.e. excellent talent visa) issued to:

O- 1: a nationally or internationally recognized figure in science, education or business, sports, literature and art;

O-2: Attaché of the above-mentioned sports or literary figures.

(16) The P visa (that is, the visa for outstanding talents in entertainment and sports) is issued to individuals or groups among outstanding performers in entertainment and outstanding athletes participating in competitions.

(17)Q visa (i.e. cultural exchange visa) is issued to those who go to the United States for short-term cultural exchange.

(18)R visa (that is, religious worker visa) is issued to those who go to the United States to engage in professional religious work for a short time.

(19) The staff visa for national defense scientific research projects is issued by the U.S. government to the staff appointed by countries with national defense equality and reciprocity treaties (no visa code).

(20) The work visa for the education of the disabled is issued to the personnel who go to the United States to carry out the education and training program for the disabled (no visa code).

In addition, there are many codes for visas in China, which are issued to:

(1)C: visa indicating that the holder is a crew member, etc.

(2)D: visa for settlement in China;

(3)F: business or visiting visa to China;

(4)G: indicates a transit visa;

(5)L: visa for coming to China or visiting relatives;

(6)X: visa for studying in China for more than half a year;

(7)Z: visa for work or employment in China;

(8)W: indicates visas issued to members of diplomatic or consular missions in China.

Visa validity period

The validity of a visa refers to a period of time from the date of issuance of the visa to the future. After this period, the visa will be invalid. Generally, countries issue entry visas valid for 3 months, while some countries issue entry visas valid for 1 month. Some countries have strict restrictions on the validity of visas, such as Germany, which only issues visas according to the date of application. The validity of transit visas is generally short.

Visa stay time

The duration of the visa refers to the time allowed for the holder to stay after entering the country. The difference between it and the visa validity period is that the visa validity period refers to the use period of the visa, that is, the holder can enter and leave the country within the specified time. If the visa is valid for 3 months and the stay period is l5 days, the visa can enter or leave the country on any day within 3 months from the date of issuance, but the holder can only stay in the country for 15 days from the date of entry to the date of exit. Some countries must enter the country within 3 months after issuance, and the stay period after entry is 1 month; In some countries, the visa entry period and stay period are the same. For example, the validity period and stay period of the American visitor visa is three months, that is, the entrant is valid for three months and can only stay for three months after entering the country. The validity period of the visa is generally 1 month or 3 months; The longest is generally half a year or more than 1 year, such as employment and study visa; The shortest is 3 days or 7 days, such as a transit visa.

Number of valid visas

In addition to the validity period and stay period, the visa also stipulates the number of valid times. Generally, it is divided into one valid visa, two valid visas and multiple valid visas. The number of times a visa is valid means that once it is used within the validity period, it will be invalid. Two valid visas, that is, you can use them twice within the validity period of the visa. Multiple valid visas, that is, within the validity period of the visa, the holder can enter and leave its territory multiple times. For example, some tourist visas for Australia and India allow multiple entry and exit within three or six months. In some countries, work visas are also applicable to multiple entry. Of course, what kind of visa to issue, how long it is valid and how many times it is valid are decided by the visa authority according to the specific situation of the entry applicant.