Non-immigrant visas are temporary visas to visit, work, or study in the United States. Most non-immigrant visas require that the visa holder maintains a residence in his or her home country. All are temporary, but most may be renewed for a period of time. Note that under US law, the burden of proof is placed upon the applicant for a non-immigrant visa to convince a consular officer that the applicant intends to return home after the expiration of the visa.