Tourist visas and transit visas are very similar in many ways. The major difference is that a tourist visa allows a traveler to spend more time enjoying the country while a transit visa simply gives the traveler enough time to pass through to the final destination. The host country’s visa requirements will tell you which visa is appropriate for your travel needs.
As of 2019, the Henley & Partners passport index ranks the Japanese, Singaporean and South Korean passports as the ones with the most visa exemptions by other nations, allowing holders of those passports to visit 189 countries without obtaining a visa in advance of arrival. However, as of 6 June 2019, the Passport Index ranks the United Arab Emirates passport as the one with the most visa exemptions by other nations, allowing holders of this passport to visit 173 countries without obtaining a visa in advance of arrival.
Our consular officers have a difficult job. They must decide in a very short time if someone is qualified to receive a temporary visa. Most cases are decided after a brief interview and review of whatever evidence of ties an applicant presents. To qualify for a visitor or student visa, an applicant must meet the requirements of sections 101(a)(15)(B) or (F) of the INA respectively. Failure to do so will result in a refusal of a visa under INA 214(b). The most frequent basis for such a refusal concerns the requirement that the prospective visitor or student possess a residence abroad he/she has no intention of abandoning. Applicants prove the existence of such residence by demonstrating that they have ties abroad that would compel them to leave the U.S. at the end of the temporary stay. The law places this burden of proof on the applicant.
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, 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, but Thailand implemented a single visa scheme with Cambodia beginning on December 27, 2012, on a trial basis.
Once in the country, the validity period of a visa or authorised stay can often be extended for a fee at the discretion of immigration authorities. Overstaying a period of authorised stay given by the immigration officers is considered illegal immigration even if the visa validity period isn't over (i.e., for multiple entry visas) and a form of being "out of status" and the offender may be fined, prosecuted, deported, or even blacklisted from entering the country again.