This is a process whereby a Permanent Resident of the United States, who is eligible to become a naturalized Citizen of United States, will apply to USCIS for naturalization.
Generally, a Permanent Resident will be eligible to apply to become a U.S citizen if he/she has been a Permanent Resident for 5 Years. However, if permanent residency is obtained through marriage to a U.S citizen(including that obtained through “Violence Against Women Act” [VAWA]), year of eligibility is 3.