what is the full form of us

The full form of US is "United States" or "United States of America". The abbreviation "U.S." (with periods inserted and no spaces) is used as an adjective describing another noun, while "USA" is used in some proper nouns, such as the names of media sources, mailing addresses, and fixed expressions such as "Made in the USA". The ISO Alpha-3 code for the United States is "USA".