All nationals listed in the chart above are eligible to apply online for an e-Tourist Visa (eTV). You must apply at least four days before you arrive in India. You can only enter India via those airports listed on the eTV website. There are five e-Visa subcategories: e-Tourist visa, e-Business visa, e-Medical visa, e-Medical Attendant Visa and e-Conference Visa.

The Form I-20 is an official U.S. Government form, issued by a certified school, which a prospective nonimmigrant student must have in order to get an F-1 or M-1 visa. Form I-20 acts as proof-of-acceptance and contains the information necessary to pay the SEVIS I-901 fee, apply for a visa or change visa status, and be admitted into the United States. The Form I-20 has the student's SEVIS identification number, which starts with the letter N and is followed by ten digits, on the top left of the form.
Visas generally expire after a set period of time. In some cases, one may be extended by permission, while in other instances, people need to leave a country and re-enter it to receive a new one. They can also establish the number of times someone enters and leaves a country. In the case of a single entry visa, it is canceled as soon as the traveler leaves the country. In multiple entry, someone may leave and return several times before the visa is canceled.
Applicants are generally advised to apply in their country of permanent residence. Any person who is legally present in Australia may apply for a visa at one of the Consulates. However, applicants should decide where to apply based on more than just convenience or delay in getting an appointment in their home district. One thing to consider, for example, is in which consular district the applicant can demonstrate the strongest ties.
The visa or the completed Visa Waiver Program document permits non-immigrant travelers to enter upon U.S. soil only to the extent that they can present themselves to a determining Department of Homeland Security official. The official and his work station are euphemistically referred to as "the gate." The document that demonstrates permission to enter the country has been granted is universally called an I-94 -- the proper term is Arrival/Departure Record -- and it is issued by the determining officer at the gate. In simple terms, the visa allows the traveler to knock on the door; the I-94 card is proof the Department of Homeland Security has allowed them to come in. The I-94 determines the time limit of the stay, and the restrictions imposed upon the visitor while in the U.S. Visas do not allow any stay of any length within the U.S. 

Visas generally expire after a set period of time. In some cases, one may be extended by permission, while in other instances, people need to leave a country and re-enter it to receive a new one. They can also establish the number of times someone enters and leaves a country. In the case of a single entry visa, it is canceled as soon as the traveler leaves the country. In multiple entry, someone may leave and return several times before the visa is canceled.
An ASEAN common visa scheme has been considered with Thailand and the "CLMV" countries of Cambodia, Laos, Myanmar and Vietnam opting in earlier. After talk arose of a CLMV common visa,[91] with Thailand being omitted, Thailand initiated and began implementation of a trial common visa with Cambodia, but cited security risks as the major hurdle. The trial run was delayed,[92] but Thailand implemented a single visa scheme with Cambodia beginning on December 27, 2012, on a trial basis.[93]
In Chrysogelou's case, she qualified for a visa waiver for her trip to the United States. And while the waiver was valid when she began her trip, the German-based Lufthansa imposes an additional requirement: Passengers must have valid documents for the "entire duration" of their stay. (After I asked Lufthansa about her case, it rescheduled her flights to her original dates.)
O-1 Extraordinary Ability Worker Visas are nonimmigrant visas for individuals who possess great talent in the sciences, arts, education, business, athletics, or the motion picture or television industry. Note that the terms "arts" also includes "culinary arts", and essential personnel in the art field such as: directors, set designers, choreographers, orchestrators, coaches, arrangers, costume designers, make-up artists, state technicians and animal trainers.
In general, to obtain a visa it will take four business days. To get a visa in 2-3 business days you can apply for the Express Service (it costs an additional 20 USD); while to get a visa within one business day you can apply for Rush Service (which costs an additional 30 USD). Note that the Rush Service is granted only in documented cases of extreme urgency.
So, for example, someone who arrives in the U.S. with a fiancé visa (K-1) and applies for a work permit will receive one that lasts only until the 90-day termination of that person’s K-1 visa. Although it might sound like this would create problems for fiancés who plan to apply for green cards after marriage and stay in the United States, it actually doesn’t. That’s because the fiance can simply apply to adjust status as soon as they’ve gotten married, and then apply for an EAD that lasts even longer, at that time.
Corporate, government and foreign credit cards are high risk.  They have the highest interchange rates.  You may ask why.  Simply, if someone from a foreign country buys an item here but refuses to pay for it later, perhaps because of a dispute, it is very difficult, sometimes almost impossible to get that money back.  Also, people in corporations and government make purchases that are not authorized by higher management.  If they quit or are terminated, these entities will often dispute the charges as unauthorized.  This makes these three card types high risk.
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