The N 400 application is the form that an individual must fill out before they can begin the naturalization process. As an individual who wishes to gain citizenship status within the United States, they must fill out the form with all of the request information. The N 400 is the official application form that an individual must complete before they can move on in the process because it is what will be referred back to frequently to give the government information that they need on the individual's permanent residency status, employment history, personal history, and any other related information. It is important that the individual be truthful and thorough on this application because it forms the basis of the naturalization process for the individual.