Immigration Status
A visa is an official authorization appended to a passport, permitting entry into and travel within a particular country or region.
It will depend on how long you want to go for, why you want to go and certain other factors as to which of the visas you must apply for.
TYPES OF VISAS IN USAUnited States offers a range of immigration opportunities and probably does more than most other countries to encourage skilled workers to move to United States. There are four main categories for visas and there is also an option for a work permit:

Skilled Worker ClassThe Skilled Worker Visa for United States is the most popular way of applying for migration to United States. This allows you to enter United States with the right to work without first needing to find a job. Find out if you qualify by using the United States Skilled Worker Points Calculator.
Business ClassUnited States Business Immigration offers three different United States Business Visa categories for business immigration to United States for potential migrants wishing to Invest or start a business in United States.
Family ClassUnited States citizens and permanent residents living in United States, eighteen years of age or older, may sponsor close relatives or family members who want to become Permanent residents of United States.
CitizenshipAlthough you can not apply for United States citizenship until you have lived in United States for at least three years, you can be thinking about what it means from the moment you arrive.
Work PermitsA work permit for United States can only be obtained if you have an offer of employment before applying for your United States work visa. United States seeks to attract temporary skilled workers to fill positions that United States employers are currently having difficulty to fill by a United States Permanent Resident or Citizen.
United States Visit VisaVisit United States with a United States Tourist Visa. A United States Visitor Visa will allow you to visit United States for up to six months.