US tourist visas are non-immigrant visas for touristic activities. Categorically they are called Non-immigrant B1/B2 visas, where B1 is issued for business purposes, including attending any conference, joining a company meeting, or negotiating a contract.

B2 Visas, on the other hand, are issued for sightseeing, seeing friends and family, and seeking medical help in US hospitals.

Both of these category visas allow you to visit the US for 6 months each time, and the visa is issued for 5 years for Bangladeshi nationals. It also comes with a host of benefits, including allowing you to travel to 21 additional countries.