To obtain a visitor visa (for tourism, medical treatment, and certain kinds of business activities), the process may be relatively simple. To obtain other types of visas, to study or work, for example, more forms and documentation will be required. Individual experience in obtaining a visa can therefore range from relatively fast and simple to relatively complex and time consuming.
Applicants also still need to demonstrate their intent to return home rather than stay permanently in the United States. You will not be granted a visa if, in the judgment of the consular officer, you have not met all of the necessary criteria.