The expiration date of your visa is the last day you may use the visa to enter the U.S. It does not indicate how long you may stay in the U.S. Your stay is determined by the Department of Homeland Security at the port of entry. As long as you comply with the Department of Homeland Security decision on the conditions of your stay, you should have no problem.
Previously, foreign travelers granted entry by CBP officials received a paper Form I-94 (Arrival/Departure Record). This process is now automated, with some exceptions. If you received a paper Form I-94 or I-94W and failed to turn in your paper Form I-94 Arrival/Departure Record to the commercial airline or CBP when you departed the U.S., see the CBP Website for instructions. Do not send your paper Form I-94 or I-94W to the U.S. Embassy or Consulate General.
If you are planning urgent travel to the United States, you will need to contact our helpline informing that you have urgent need for your passport and request for an update of your visa application. You will have to wait for the response from the Embassy/Consulate. When your passport/document is returned to you, it will be delivered to the document delivery address you have provided at the time of appointment scheduling.
Some visas can be granted on arrival or by prior application at the country's embassy or consulate, or through a private visa service specialist who is specialised in the issuance of international travel documents. These agencies are authorised by the foreign authority, embassy, or consulate to represent international travellers who are unable or unwilling to travel to the embassy and apply in person. Private visa and passport services collect an additional fee for verifying customer applications, supporting documents, and submitting them to the appropriate authority. If there is no embassy or consulate in one's home country, then one would have to travel to a third country (or apply by post) and try to get a visa issued there. Alternatively, in such cases visas may be pre-arranged for collection on arrival at the border. The need or absence of need of a visa generally depends on the citizenship of the applicant, the intended duration of the stay, and the activities that the applicant may wish to undertake in the country he visits; these may delineate different formal categories of visas, with different issue conditions.

Both B1 and B2 are visas for temporary stay in US. The B1 visa is business visa and can be used by the applicant to travel to US for business related issues. The B2 visa is tourist visa and the applicant can visit places and must have entered US only for touring purposes. No activities of any financial gain must be carried out during visit by the tourist visa holder. Both B1 and B2 visa…
A country’s visa policy is a rule that states who may or may not enter the country. The policy may allow passport holders of one country to enter visa-free but not the passport holders of another country. Most visa policies are bilateral, meaning that two countries will allow visa-free travel to each other’s citizens, but this is not always the case. For example, Canadian passport holders may travel to Grenada visa-free, but Grenadians must apply for a visa in order to travel to Canada.
A social security card is used in the U.S. as way to prove your identity. Each social security card has a 9-digit social security number (SSN). This number is unique to each person and used for the purpose of tracking an individual in the U.S. Social Security Administration. All people who work in the U.S. must have a SSN. SSNs are mostly used for tax purposes.
A fee may be charged for issuing a visa; these are often also reciprocal—hence, if country A charges country B's citizens US$50 for a visa, country B will often also charge the same amount for country A's visitors. The fee charged may also be at the discretion of each embassy. A similar reciprocity often applies to the duration of the visa (the period in which one is permitted to request entry of the country) and the number of entries one can attempt with the visa. Other restrictions, such as requiring fingerprints and photographs, may also be reciprocated. Expedited processing of the visa application for some countries will generally incur additional charges.
Some countries, such as Canada and the United States, may require the visitor to include a letter of invitation with their travel visa application. A letter of invitation is a formal letter from the person you intend to visit stating that they are inviting you to visit them in that country. Invitation letters help travel authorities vet potential visitors by making sure that a temporary visit is indeed the true nature of the visa request. Check with your intended destination’s government website for details on what needs to be included in a such a letter.

On what basis would she be able to adjust status once in the U.S.? Of course she shouldn't do this. If immigration officials even *think she entered the U.S. on a tourist visa with the intention of immigrating, she'll never adjust status. It's never advisable to enter the U.S. on a tourist visa with the intent of immigrating. http://www.dixonimmigration.com/index.php?pid=2
A visa (from the Latin charta visa, meaning "paper that has been seen")[1] is a conditional authorisation granted by a territory to a foreigner, allowing them to enter, remain within, or to leave that territory. Visas typically may include limits on the duration of the foreigner's stay, areas within the country they may enter, the dates they may enter, the number of permitted visits or an individual's right to work in the country in question. Visas are associated with the request for permission to enter a territory and thus are, in most countries, distinct from actual formal permission for an alien to enter and remain in the country. In each instance, a visa is subject to entry permission by an immigration official at the time of actual entry, and can be revoked at any time. A visa most commonly takes the form of a sticker endorsed in the applicant's passport or other travel document.
P athletes, entertainers, and artists: The time period necessary to accomplish the event or activity, plus ten days before the validity period of the visa petition and up to ten days after the petition expires. Initially up to five years for athletes, one year for other artists and entertainers. Extensions possible. Ten-year maximum for athletes; no maximum on others.
Some types of visa like B1 may not expire with the expiry of the holder's passport. An unexpired, endorsed visa in an expired passport may be presented for entry into the USA, as long as the visa itself has not been cancelled, is undamaged, is less than 10 years old and is presented with a valid non-expired passport, provided that both passports are for the same nationality.

Marriage visa, granted for a limited period before intended marriage or civil partnership based on a proven relationship with a citizen of the destination country. For example, a German woman wishing to marry an American man would obtain a Fiancée Visa (also known as a K-1 visa) to allow her to enter the United States. A K1 Fiancée Visa is valid for four months from the date of its approval.[12]
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] 

H-3 trainees: The length of the proposed training program, plus up to ten days before and after the start and end dates. If the initial program was designed to last for a shorter period than this but has been continued, the employer may request an extension from USCIS, up to the maximum authorized stay, which is two years (or 18 months for a special education exchange program).
In some cases, a visa is issued by immigration officials when someone crosses a border into a new country. In other instances, people must apply for one before traveling. During the application process, the applicant may be asked if he or she has enough money to survive in the country for the duration of the visa, and inquiries may be made about the applicant's health, character, and intentions for the planned visit. In some cases, applicants are also fingerprinted and photographed.
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