A passport can be used as one of the most reliable forms of identification. A U.S. passport is issued by the U.S. Department of State and is almost impossible to forge. This makes a passport an irrefutable form of identification. Currently a passport is the only type of national identification that is available in the United States.
A passport can be used to prove your citizenship. Since the application process for a U.S. passport is extensive it would be nearly impossible to obtain a U.S. passport without being a citizen. So if your citizenship is ever in question being able to show the authorities your passport can clear up any confusion quickly.
As a U.S. citizen it is necessary to have a U.S. passport when traveling to other countries. A U.S. passport is an irrefutable document and proves that you are a U.S. citizen. Having this proof while traveling in another country is important in case something happens, for example, if you get injured and need medical care. It is also necessary to have a passport to be allowed to re-enter the United States.
A passport contains pages that are stamped when you enter another country. These stamps contain the name of the country in which you have traveled which makes a passport a good tool for tracking where you have been, and a reminder of where you have yet to go.
