Tourist Visa is a non-immigrant visa issued to people entering United States temporarily for enjoyment or tourism. Any foreign citizen including parents who wants to visit USA for tourism, visiting children, family, friends, and relatives for attending special events, family functions or ceremonies may qualify and can apply for Tourist Visa. Visitor visa is subject to approval. You must apply and get the visitor visa stamped in your passport.
Under this visa every single person has to undergone a personal interview process. Tourist visa is granted for a specific purpose only, like tourism, medical treatment, etc. Person entering the United States on visitor visa should not be involved in study, business, or work. If the purpose of your trip is business, you must apply for US Business Visa (B1 Visa).
In United States a tourist visa can be of 6 months or less, which is subject to grant at the port of entry at US airport on arrival. An additional to maximum 6 months may be possible which is subject to sanction.
Getting a tourist visa to USA is subject to sanction. Each applicant must have a valid passport, submit the application form, pay the fee, and appear for the tourist visa interview at the nearest applicable US consulate.