How does a non-immigrant work visa compare to a US immigration visa?

A non-immigrant temporary work visa to the USA is stamped on a page of the passport of a foreign worker who has been approved to live and work in America for the time period specified in the visa, and it is also presented to US officials when arriving in the United States at the port of entry (usually an airport). Depending on the type of non-immigrant temporary work visa and other factors, the foreign worker may be permitted to live and work in the United States for an initial period of up to 12-60 months, plus there may be an option to renew/extend the temporary work visa if certain criteria are met. The US immigration visa is likewise stamped on a page of the Lawful Permanent Resident’s passport, is valid for a specified period of time and is presented to officials upon arrival at the port of entry in the United States. In addition to receiving the US immigration visa, a Green Card will also be obtained by the Lawful Permanent Resident and carried as proof of the legal right to live, study and work in the United States long-term (i.e., even after the US immigration visa has expired).