H1B and O-1 visas are two different types of visas that are available to people who want to work in the United States. An H1B visa is a nonimmigrant visa that is available to individuals who have a job offer from a U.S. employer in a specialty occupation. H1B visas are granted for a period of up to three years, and they can be renewed once. An O-1 visa, on the other hand, is a nonimmigrant visa that is available to people who have extraordinary ability or achievement in their field. An o-1 visa is granted for 3 years and can be renewed an indefinite number of times. One of the main differences between H1B and O-1 visas is the requirements for eligibility. In order to be eligible for an H1B visa, an individual must have a job offer from a U.S. employer in a specialty occupation, and they must have the necessary qualifications and experience to perform the job. To be eligible for an O-1 visa, an individual must have received national or international recognition for their achievements, and they must have been offered a job in the United States that is related to their area of expertise. Additionally, O-1 visa holders may be able to apply for permanent residency in the United States, while H1B visa holders are not eligible to do so.